[3.12] gh-130160: use .. program:: directive for documenting ensurepip CLI (gh-130253) (gh-130258)

gh-130160: use `.. program::` directive for documenting `ensurepip` CLI (gh-130253)
(cherry picked from commit 8cd7f8b)

Co-authored-by: Kanishk Pachauri <itskanishkp.py@gmail.com>

Author: miss-islington

Doc/library/ensurepip.rst

@@ -43,6 +43,8 @@ when creating a virtual environment) or after explicitly uninstalling
 Command line interface
 ----------------------
 
+.. program:: ensurepip
+
 The command line interface is invoked using the interpreter's ``-m`` switch.
 
 The simplest possible invocation is::
@@ -61,26 +63,34 @@ By default, ``pip`` is installed into the current virtual environment
 active virtual environment). The installation location can be controlled
 through two additional command line options:
 
-* :samp:`--root {dir}`: Installs ``pip`` relative to the given root directory
-  rather than the root of the currently active virtual environment (if any)
-  or the default root for the current Python installation.
-* ``--user``: Installs ``pip`` into the user site packages directory rather
-  than globally for the current Python installation (this option is not
-  permitted inside an active virtual environment).
+.. option:: --root <dir>
+
+   Installs ``pip`` relative to the given root directory rather than the root
+   of the currently active virtual environment (if any) or the default root
+   for the current Python installation.
+
+.. option:: --user
+
+   Installs ``pip`` into the user site packages directory rather than globally
+   for the current Python installation (this option is not permitted inside an
+   active virtual environment).
 
 By default, the scripts ``pipX`` and ``pipX.Y`` will be installed (where
 X.Y stands for the version of Python used to invoke ``ensurepip``). The
 scripts installed can be controlled through two additional command line
 options:
 
-* ``--altinstall``: if an alternate installation is requested, the ``pipX``
-  script will *not* be installed.
+.. option:: --altinstall
 
-* ``--default-pip``: if a "default pip" installation is requested, the
-  ``pip`` script will be installed in addition to the two regular scripts.
+   If an alternate installation is requested, the ``pipX`` script will *not* be
+   installed.
 
-Providing both of the script selection options will trigger an exception.
+.. option:: --default-pip
+
+   If a "default pip" installation is requested, the ``pip`` script will be
+   installed in addition to the two regular scripts.
 
+Providing both of the script selection options will trigger an exception.
 
 Module API
 ----------
@@ -136,3 +146,4 @@ Module API
       ``pip``, but other software should not assume those dependencies will
       always be present by default (as the dependencies may be removed in a
       future version of ``pip``).
+