Issue #26462: Doc: avoid literal_block warnings, fix syntax highlighting.

Patch by Julien Palard.
diff --git a/Doc/library/2to3.rst b/Doc/library/2to3.rst
index 9f59dda..8496676 100644
--- a/Doc/library/2to3.rst
+++ b/Doc/library/2to3.rst
@@ -33,14 +33,18 @@
    name = raw_input()
    greet(name)
 
-It can be converted to Python 3.x code via 2to3 on the command line::
+It can be converted to Python 3.x code via 2to3 on the command line:
+
+.. code-block:: shell-session
 
    $ 2to3 example.py
 
 A diff against the original source file is printed.  2to3 can also write the
 needed modifications right back to the source file.  (A backup of the original
 file is made unless :option:`-n` is also given.)  Writing the changes back is
-enabled with the :option:`-w` flag::
+enabled with the :option:`-w` flag:
+
+.. code-block:: shell-session
 
    $ 2to3 -w example.py
 
@@ -57,17 +61,23 @@
 By default, 2to3 runs a set of :ref:`predefined fixers <2to3-fixers>`.  The
 :option:`-l` flag lists all available fixers.  An explicit set of fixers to run
 can be given with :option:`-f`.  Likewise the :option:`!-x` explicitly disables a
-fixer.  The following example runs only the ``imports`` and ``has_key`` fixers::
+fixer.  The following example runs only the ``imports`` and ``has_key`` fixers:
+
+.. code-block:: shell-session
 
    $ 2to3 -f imports -f has_key example.py
 
-This command runs every fixer except the ``apply`` fixer::
+This command runs every fixer except the ``apply`` fixer:
+
+.. code-block:: shell-session
 
    $ 2to3 -x apply example.py
 
 Some fixers are *explicit*, meaning they aren't run by default and must be
 listed on the command line to be run.  Here, in addition to the default fixers,
-the ``idioms`` fixer is run::
+the ``idioms`` fixer is run:
+
+.. code-block:: shell-session
 
    $ 2to3 -f all -f idioms example.py
 
@@ -113,7 +123,9 @@
 
 The :option:`--add-suffix` option specifies a string to append to all output
 filenames.  The :option:`-n` flag is required when specifying this as backups
-are not necessary when writing to different filenames.  Example::
+are not necessary when writing to different filenames.  Example:
+
+.. code-block:: shell-session
 
    $ 2to3 -n -W --add-suffix=3 example.py
 
@@ -122,7 +134,9 @@
 .. versionadded:: 2.7.3
    The :option:`--add-suffix` option was added.
 
-To translate an entire project from one directory tree to another use::
+To translate an entire project from one directory tree to another use:
+
+.. code-block:: shell-session
 
    $ 2to3 --output-dir=python3-version/mycode -W -n python2-version/mycode
 
diff --git a/Doc/library/argparse.rst b/Doc/library/argparse.rst
index 1dfebc2..bdc699f 100644
--- a/Doc/library/argparse.rst
+++ b/Doc/library/argparse.rst
@@ -44,7 +44,9 @@
    print args.accumulate(args.integers)
 
 Assuming the Python code above is saved into a file called ``prog.py``, it can
-be run at the command line and provides useful help messages::
+be run at the command line and provides useful help messages:
+
+.. code-block:: shell-session
 
    $ python prog.py -h
    usage: prog.py [-h] [--sum] N [N ...]
@@ -59,7 +61,9 @@
     --sum       sum the integers (default: find the max)
 
 When run with the appropriate arguments, it prints either the sum or the max of
-the command-line integers::
+the command-line integers:
+
+.. code-block:: shell-session
 
    $ python prog.py 1 2 3 4
    4
@@ -67,7 +71,9 @@
    $ python prog.py 1 2 3 4 --sum
    10
 
-If invalid arguments are passed in, it will issue an error::
+If invalid arguments are passed in, it will issue an error:
+
+.. code-block:: shell-session
 
    $ python prog.py a b c
    usage: prog.py [-h] [--sum] N [N ...]
@@ -187,7 +193,9 @@
    args = parser.parse_args()
 
 The help for this program will display ``myprogram.py`` as the program name
-(regardless of where the program was invoked from)::
+(regardless of where the program was invoked from):
+
+.. code-block:: shell-session
 
    $ python myprogram.py --help
    usage: myprogram.py [-h] [--foo FOO]
@@ -550,7 +558,9 @@
    args = parser.parse_args()
 
 If ``-h`` or ``--help`` is supplied at the command line, the ArgumentParser
-help will be printed::
+help will be printed:
+
+.. code-block:: shell-session
 
    $ python myprogram.py --help
    usage: myprogram.py [-h] [--foo FOO]
diff --git a/Doc/library/ast.rst b/Doc/library/ast.rst
index cf0c32e..6d5855b 100644
--- a/Doc/library/ast.rst
+++ b/Doc/library/ast.rst
@@ -113,6 +113,7 @@
 The abstract grammar is currently defined as follows:
 
 .. literalinclude:: ../../Parser/Python.asdl
+   :language: none
 
 
 :mod:`ast` Helpers
diff --git a/Doc/library/cgi.rst b/Doc/library/cgi.rst
index da15e00..1bfdb39 100644
--- a/Doc/library/cgi.rst
+++ b/Doc/library/cgi.rst
@@ -450,7 +450,9 @@
 invoked as a script, the file will dump its environment and the contents of the
 form in HTML form. Give it the right mode etc, and send it a request.  If it's
 installed in the standard :file:`cgi-bin` directory, it should be possible to
-send it a request by entering a URL into your browser of the form::
+send it a request by entering a URL into your browser of the form:
+
+.. code-block:: none
 
    http://yourhostname/cgi-bin/cgi.py?name=Joe+Blow&addr=At+Home
 
@@ -542,4 +544,3 @@
    field values should be supplied in, but knowing whether a request was
    received from a conforming browser, or even from a browser at all, is tedious
    and error-prone.
-
diff --git a/Doc/library/doctest.rst b/Doc/library/doctest.rst
index 4558123..43be33e 100644
--- a/Doc/library/doctest.rst
+++ b/Doc/library/doctest.rst
@@ -91,14 +91,18 @@
        doctest.testmod()
 
 If you run :file:`example.py` directly from the command line, :mod:`doctest`
-works its magic::
+works its magic:
+
+.. code-block:: shell-session
 
    $ python example.py
    $
 
 There's no output!  That's normal, and it means all the examples worked.  Pass
 ``-v`` to the script, and :mod:`doctest` prints a detailed log of what
-it's trying, and prints a summary at the end::
+it's trying, and prints a summary at the end:
+
+.. code-block:: shell-session
 
    $ python example.py -v
    Trying:
@@ -117,7 +121,9 @@
        [1, 1, 2, 6, 24, 120]
    ok
 
-And so on, eventually ending with::
+And so on, eventually ending with:
+
+.. code-block:: none
 
    Trying:
        factorial(1e100)
@@ -205,7 +211,9 @@
 That short script executes and verifies any interactive Python examples
 contained in the file :file:`example.txt`.  The file content is treated as if it
 were a single giant docstring; the file doesn't need to contain a Python
-program!   For example, perhaps :file:`example.txt` contains this::
+program!   For example, perhaps :file:`example.txt` contains this:
+
+.. code-block:: none
 
    The ``example`` module
    ======================
diff --git a/Doc/library/htmlparser.rst b/Doc/library/htmlparser.rst
index e73ce07..6740b43 100644
--- a/Doc/library/htmlparser.rst
+++ b/Doc/library/htmlparser.rst
@@ -78,7 +78,9 @@
    parser.feed('<html><head><title>Test</title></head>'
                '<body><h1>Parse me!</h1></body></html>')
 
-The output will then be::
+The output will then be:
+
+.. code-block:: none
 
    Encountered a start tag: html
    Encountered a start tag: head
diff --git a/Doc/library/idle.rst b/Doc/library/idle.rst
index 84805ff..729ca6e 100644
--- a/Doc/library/idle.rst
+++ b/Doc/library/idle.rst
@@ -520,7 +520,7 @@
 Command line usage
 ^^^^^^^^^^^^^^^^^^
 
-::
+.. code-block:: none
 
    idle.py [-c command] [-d] [-e] [-h] [-i] [-r file] [-s] [-t title] [-] [arg] ...
 
diff --git a/Doc/library/logging.config.rst b/Doc/library/logging.config.rst
index 5460c3a..23333ed 100644
--- a/Doc/library/logging.config.rst
+++ b/Doc/library/logging.config.rst
@@ -209,7 +209,9 @@
     handler.
 
   All *other* keys are passed through as keyword arguments to the
-  handler's constructor.  For example, given the snippet::
+  handler's constructor.  For example, given the snippet:
+
+  .. code-block:: yaml
 
       handlers:
         console:
@@ -318,7 +320,9 @@
 configuration to indicate that a connection exists between the source
 and the destination object with that id.
 
-So, for example, consider the following YAML snippet::
+So, for example, consider the following YAML snippet:
+
+.. code-block:: yaml
 
     formatters:
       brief:
@@ -375,7 +379,9 @@
 configuration dictionary and which returns the instantiated object.
 This is signalled by an absolute import path to the factory being
 made available under the special key ``'()'``.  Here's a concrete
-example::
+example:
+
+.. code-block:: yaml
 
     formatters:
       brief:
@@ -592,7 +598,9 @@
    :func:`dictConfig`, so it's worth considering transitioning to this newer
    API when it's convenient to do so.
 
-Examples of these sections in the file are given below. ::
+Examples of these sections in the file are given below.
+
+.. code-block:: ini
 
    [loggers]
    keys=root,log02,log03,log04,log05,log06,log07
@@ -604,7 +612,9 @@
    keys=form01,form02,form03,form04,form05,form06,form07,form08,form09
 
 The root logger must specify a level and a list of handlers. An example of a
-root logger section is given below. ::
+root logger section is given below.
+
+.. code-block:: ini
 
    [logger_root]
    level=NOTSET
@@ -621,7 +631,9 @@
 file.
 
 For loggers other than the root logger, some additional information is required.
-This is illustrated by the following example. ::
+This is illustrated by the following example.
+
+.. code-block:: ini
 
    [logger_parser]
    level=DEBUG
@@ -639,7 +651,8 @@
 say the name used by the application to get the logger.
 
 Sections which specify handler configuration are exemplified by the following.
-::
+
+.. code-block:: ini
 
    [handler_hand01]
    class=StreamHandler
@@ -663,7 +676,9 @@
 The ``args`` entry, when :func:`eval`\ uated in the context of the ``logging``
 package's namespace, is the list of arguments to the constructor for the handler
 class. Refer to the constructors for the relevant handlers, or to the examples
-below, to see how typical entries are constructed. ::
+below, to see how typical entries are constructed.
+
+.. code-block:: ini
 
    [handler_hand02]
    class=FileHandler
@@ -714,7 +729,9 @@
    formatter=form09
    args=('localhost:9022', '/log', 'GET')
 
-Sections which specify formatter configuration are typified by the following. ::
+Sections which specify formatter configuration are typified by the following.
+
+.. code-block:: ini
 
    [formatter_form01]
    format=F1 %(asctime)s %(levelname)s %(message)s
@@ -750,5 +767,3 @@
 
    Module :mod:`logging.handlers`
       Useful handlers included with the logging module.
-
-
diff --git a/Doc/library/optparse.rst b/Doc/library/optparse.rst
index c1ed15b..5466462 100644
--- a/Doc/library/optparse.rst
+++ b/Doc/library/optparse.rst
@@ -680,7 +680,9 @@
 this option on the command line, it expands your ``version`` string (by
 replacing ``%prog``), prints it to stdout, and exits.
 
-For example, if your script is called ``/usr/bin/foo``::
+For example, if your script is called ``/usr/bin/foo``:
+
+.. code-block:: shell-session
 
    $ /usr/bin/foo --version
    foo 1.0
@@ -730,14 +732,18 @@
 error status 2.
 
 Consider the first example above, where the user passes ``4x`` to an option
-that takes an integer::
+that takes an integer:
+
+.. code-block:: shell-session
 
    $ /usr/bin/foo -n 4x
    Usage: foo [options]
 
    foo: error: option -n: invalid integer value: '4x'
 
-Or, where the user fails to pass a value at all::
+Or, where the user fails to pass a value at all:
+
+.. code-block:: shell-session
 
    $ /usr/bin/foo -n
    Usage: foo [options]
diff --git a/Doc/library/pyexpat.rst b/Doc/library/pyexpat.rst
index bb0da9d..ffa042b 100644
--- a/Doc/library/pyexpat.rst
+++ b/Doc/library/pyexpat.rst
@@ -87,7 +87,9 @@
    separator.
 
    For example, if *namespace_separator* is set to a space character (``' '``) and
-   the following document is parsed::
+   the following document is parsed:
+
+   .. code-block:: xml
 
       <?xml version="1.0"?>
       <root xmlns    = "http://default-namespace.org/"
diff --git a/Doc/library/shutil.rst b/Doc/library/shutil.rst
index 2bf9680..527cbd0 100644
--- a/Doc/library/shutil.rst
+++ b/Doc/library/shutil.rst
@@ -342,7 +342,9 @@
     >>> make_archive(archive_name, 'gztar', root_dir)
     '/Users/tarek/myarchive.tar.gz'
 
-The resulting archive contains::
+The resulting archive contains:
+
+.. code-block:: shell-session
 
     $ tar -tzvf /Users/tarek/myarchive.tar.gz
     drwx------ tarek/staff       0 2010-02-01 16:23:40 ./
diff --git a/Doc/library/socketserver.rst b/Doc/library/socketserver.rst
index a7c3e3e..a81214e 100644
--- a/Doc/library/socketserver.rst
+++ b/Doc/library/socketserver.rst
@@ -481,7 +481,9 @@
 
 The output of the example should look something like this:
 
-Server::
+Server:
+
+.. code-block:: shell-session
 
    $ python TCPServer.py
    127.0.0.1 wrote:
@@ -489,7 +491,9 @@
    127.0.0.1 wrote:
    python is nice
 
-Client::
+Client:
+
+.. code-block:: shell-session
 
    $ python TCPClient.py hello world with TCP
    Sent:     hello world with TCP
@@ -604,7 +608,9 @@
        server.server_close()
 
 
-The output of the example should look something like this::
+The output of the example should look something like this:
+
+.. code-block:: shell-session
 
    $ python ThreadedTCPServer.py
    Server loop running in thread: Thread-1
diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst
index 86a42ae..1bb3ac1 100644
--- a/Doc/library/subprocess.rst
+++ b/Doc/library/subprocess.rst
@@ -706,20 +706,23 @@
 Replacing /bin/sh shell backquote
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-::
+.. code-block:: bash
 
    output=`mycmd myarg`
-   # becomes
-   output = check_output(["mycmd", "myarg"])
 
+becomes::
+
+   output = check_output(["mycmd", "myarg"])
 
 Replacing shell pipeline
 ^^^^^^^^^^^^^^^^^^^^^^^^
 
-::
+.. code-block:: bash
 
    output=`dmesg | grep hda`
-   # becomes
+
+becomes::
+
    p1 = Popen(["dmesg"], stdout=PIPE)
    p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
    p1.stdout.close()  # Allow p1 to receive a SIGPIPE if p2 exits.
@@ -729,10 +732,14 @@
 to receive a SIGPIPE if p2 exits before p1.
 
 Alternatively, for trusted input, the shell's own pipeline support may still
-be used directly::
+be used directly:
+
+.. code-block:: bash
 
    output=`dmesg | grep hda`
-   # becomes
+
+becomes::
+
    output=check_output("dmesg | grep hda", shell=True)
 
 
diff --git a/Doc/library/zipimport.rst b/Doc/library/zipimport.rst
index 91305f6..e43f2a6 100644
--- a/Doc/library/zipimport.rst
+++ b/Doc/library/zipimport.rst
@@ -149,7 +149,9 @@
 --------
 
 Here is an example that imports a module from a ZIP archive - note that the
-:mod:`zipimport` module is not explicitly used. ::
+:mod:`zipimport` module is not explicitly used.
+
+.. code-block:: shell-session
 
    $ unzip -l example.zip
    Archive:  example.zip