[3.11] gh-101100: Fix Sphinx warnings in `library/cmd.rst` (GH-113502) (#113510)

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

Doc/library/cmd.rst

@@ -66,27 +66,30 @@ A :class:`Cmd` instance has the following methods:
       single: ! (exclamation); in a command interpreter
 
    An interpreter instance will recognize a command name ``foo`` if and only if it
-   has a method :meth:`do_foo`.  As a special case, a line beginning with the
+   has a method :meth:`!do_foo`.  As a special case, a line beginning with the
    character ``'?'`` is dispatched to the method :meth:`do_help`.  As another
    special case, a line beginning with the character ``'!'`` is dispatched to the
-   method :meth:`do_shell` (if such a method is defined).
+   method :meth:`!do_shell` (if such a method is defined).
 
    This method will return when the :meth:`postcmd` method returns a true value.
    The *stop* argument to :meth:`postcmd` is the return value from the command's
    corresponding :meth:`!do_\*` method.
 
    If completion is enabled, completing commands will be done automatically, and
-   completing of commands args is done by calling :meth:`complete_foo` with
+   completing of commands args is done by calling :meth:`!complete_foo` with
    arguments *text*, *line*, *begidx*, and *endidx*.  *text* is the string prefix
    we are attempting to match: all returned matches must begin with it. *line* is
    the current input line with leading whitespace removed, *begidx* and *endidx*
    are the beginning and ending indexes of the prefix text, which could be used to
    provide different completion depending upon which position the argument is in.
 
-   All subclasses of :class:`Cmd` inherit a predefined :meth:`do_help`.  This
+
+.. method:: Cmd.do_help(arg)
+
+   All subclasses of :class:`Cmd` inherit a predefined :meth:`!do_help`.  This
    method, called with an argument ``'bar'``, invokes the corresponding method
-   :meth:`help_bar`, and if that is not present, prints the docstring of
-   :meth:`do_bar`, if available.  With no argument, :meth:`do_help` lists all
+   :meth:`!help_bar`, and if that is not present, prints the docstring of
+   :meth:`!do_bar`, if available.  With no argument, :meth:`!do_help` lists all
    available help topics (that is, all commands with corresponding
    :meth:`!help_\*` methods or commands that have docstrings), and also lists any
    undocumented commands.
@@ -219,8 +222,8 @@ Instances of :class:`Cmd` subclasses have some public instance variables:
 .. attribute:: Cmd.use_rawinput
 
    A flag, defaulting to true.  If true, :meth:`cmdloop` uses :func:`input` to
-   display a prompt and read the next command; if false, :meth:`sys.stdout.write`
-   and :meth:`sys.stdin.readline` are used. (This means that by importing
+   display a prompt and read the next command; if false, :data:`sys.stdout.write() <sys.stdout>`
+   and :data:`sys.stdin.readline() <sys.stdin>` are used. (This means that by importing
    :mod:`readline`, on systems that support it, the interpreter will automatically
    support :program:`Emacs`\ -like line editing  and command-history keystrokes.)
 
@@ -239,14 +242,14 @@ This section presents a simple example of how to build a shell around a few of
 the commands in the :mod:`turtle` module.
 
 Basic turtle commands such as :meth:`~turtle.forward` are added to a
-:class:`Cmd` subclass with method named :meth:`do_forward`.  The argument is
+:class:`Cmd` subclass with method named :meth:`!do_forward`.  The argument is
 converted to a number and dispatched to the turtle module.  The docstring is
 used in the help utility provided by the shell.
 
 The example also includes a basic record and playback facility implemented with
 the :meth:`~Cmd.precmd` method which is responsible for converting the input to
-lowercase and writing the commands to a file.  The :meth:`do_playback` method
-reads the file and adds the recorded commands to the :attr:`cmdqueue` for
+lowercase and writing the commands to a file.  The :meth:`!do_playback` method
+reads the file and adds the recorded commands to the :attr:`~Cmd.cmdqueue` for
 immediate playback::
 
     import cmd, sys

Doc/tools/.nitignore

@@ -31,7 +31,6 @@ Doc/library/asyncio-policy.rst
 Doc/library/asyncio-subprocess.rst
 Doc/library/asyncio-task.rst
 Doc/library/bdb.rst
-Doc/library/cmd.rst
 Doc/library/collections.rst
 Doc/library/concurrent.futures.rst
 Doc/library/configparser.rst