Remove duplicate words in docs. (GH-26167) (GH-26296)

(cherry picked from commit b06ed1d883cd79c920c514d8a1f4643cf93dc5e0)

Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com>
diff --git a/Doc/library/enum.rst b/Doc/library/enum.rst
index 466d959..137fe50 100644
--- a/Doc/library/enum.rst
+++ b/Doc/library/enum.rst
@@ -595,8 +595,8 @@
 
    A :keyword:`class` decorator specifically for enumerations.  It replaces the
    :meth:`__repr__` method with one that shows *module_name*.*member_name*.  It
-   also injects the members, and their aliases, into the the global namespace
-   they were defined in.
+   also injects the members, and their aliases, into the global namespace they
+   were defined in.
 
 
 .. decorator:: property
diff --git a/Doc/library/fileinput.rst b/Doc/library/fileinput.rst
index 8196400..3880ed3 100644
--- a/Doc/library/fileinput.rst
+++ b/Doc/library/fileinput.rst
@@ -205,7 +205,7 @@
    modules.  If the filename extension is not ``'.gz'`` or ``'.bz2'``, the file is
    opened normally (ie, using :func:`open` without any decompression).
 
-   The *encoding* and *errors* values are passed to to :class:`io.TextIOWrapper`
+   The *encoding* and *errors* values are passed to :class:`io.TextIOWrapper`
    for compressed files and open for normal files.
 
    Usage example:  ``fi = fileinput.FileInput(openhook=fileinput.hook_compressed, encoding="utf-8")``
diff --git a/Doc/library/types.rst b/Doc/library/types.rst
index b3fac293..2dfc0f2 100644
--- a/Doc/library/types.rst
+++ b/Doc/library/types.rst
@@ -278,8 +278,8 @@
 
    .. attribute:: __spec__
 
-      A record of the the module's import-system-related state. Expected to be
-      an instance of :class:`importlib.machinery.ModuleSpec`.
+      A record of the module's import-system-related state. Expected to be an
+      instance of :class:`importlib.machinery.ModuleSpec`.
 
       .. versionadded:: 3.4
 
diff --git a/Doc/library/unittest.mock.rst b/Doc/library/unittest.mock.rst
index 1604731..f1c0757 100644
--- a/Doc/library/unittest.mock.rst
+++ b/Doc/library/unittest.mock.rst
@@ -328,8 +328,8 @@
 
     .. method:: assert_called_once_with(*args, **kwargs)
 
-       Assert that the mock was called exactly once and that that call was
-       with the specified arguments.
+       Assert that the mock was called exactly once and that call was with the
+       specified arguments.
 
             >>> mock = Mock(return_value=None)
             >>> mock('foo', bar='baz')