[3.8] bpo-38738: Fix formatting of True and False. (GH-17083) (GH-17125)

* "Return true/false" is replaced with "Return ``True``/``False``"
  if the function actually returns a bool.
* Fixed formatting of some True and False literals (now in monospace).
* Replaced "True/False" with "true/false" if it can be not only bool.
* Replaced some 1/0 with True/False if it corresponds the code.
* "Returns <bool>" is replaced with "Return <bool>".
(cherry picked from commit 138ccbb02216ca086047c3139857fb44f3dab1f9)
diff --git a/Doc/library/venv.rst b/Doc/library/venv.rst
index a834ac7..3483ef3 100644
--- a/Doc/library/venv.rst
+++ b/Doc/library/venv.rst
@@ -276,9 +276,9 @@
         This builder installs setuptools and pip so that you can pip or
         easy_install other packages into the created virtual environment.
 
-        :param nodist: If True, setuptools and pip are not installed into the
+        :param nodist: If true, setuptools and pip are not installed into the
                        created virtual environment.
-        :param nopip: If True, pip is not installed into the created
+        :param nopip: If true, pip is not installed into the created
                       virtual environment.
         :param progress: If setuptools or pip are installed, the progress of the
                          installation can be monitored by passing a progress