Fix typos '.::' should typically just be '::'. (GH-6165) (GH-6300)

(cherry picked from commit 78553138be)

Co-authored-by: Julien Palard <julien@palard.fr>

Doc/faq/windows.rst

@@ -60,7 +60,7 @@ program. So, how do you arrange for the interpreter to handle your Python?
 First, you need to make sure that your command window recognises the word
 "python" as an instruction to start the interpreter.  If you have opened a
 command window, you should try entering the command ``python`` and hitting
-return.::
+return::
 
    C:\Users\YourName> python
 

Doc/library/argparse.rst

@@ -981,7 +981,7 @@ is used when no command-line argument was present::
 
 
 Providing ``default=argparse.SUPPRESS`` causes no attribute to be added if the
-command-line argument was not present.::
+command-line argument was not present::
 
    >>> parser = argparse.ArgumentParser()
    >>> parser.add_argument('--foo', default=argparse.SUPPRESS)

Doc/library/mmap.rst

@@ -127,7 +127,7 @@ To map anonymous memory, -1 should be passed as the fileno along with the length
 
 
    :class:`~mmap.mmap` can also be used as a context manager in a :keyword:`with`
-   statement.::
+   statement::
 
       import mmap