[3.14] GH-106235: Clarify parse_known_args documentation by removing "remaining" (GH-126921) (#134913)

GH-106235: Clarify `parse_known_args` documentation by removing "remaining" (GH-126921)
(cherry picked from commit a4251411a9)

Co-authored-by: Savannah Bailey <savannahostrowski@gmail.com>

Doc/library/argparse.rst

@@ -2122,12 +2122,15 @@ Partial parsing
 
 .. method:: ArgumentParser.parse_known_args(args=None, namespace=None)
 
-   Sometimes a script may only parse a few of the command-line arguments, passing
+   Sometimes a script only needs to handle a specific set of command-line
-   the remaining arguments on to another script or program. In these cases, the
+   arguments, leaving any unrecognized arguments for another script or program.
-   :meth:`~ArgumentParser.parse_known_args` method can be useful.  It works much like
+   In these cases, the :meth:`~ArgumentParser.parse_known_args` method can be
-   :meth:`~ArgumentParser.parse_args` except that it does not produce an error when
+   useful.
-   extra arguments are present.  Instead, it returns a two item tuple containing
+
-   the populated namespace and the list of remaining argument strings.
+   This method works similarly to :meth:`~ArgumentParser.parse_args`, but it does
+   not raise an error for extra, unrecognized arguments. Instead, it parses the
+   known arguments and returns a two item tuple that contains the populated
+   namespace and the list of any unrecognized arguments.
 
    ::