Update Doc/library/argparse.rst

Co-authored-by: Savannah Ostrowski <savannah@python.org>

Author: davesteele

Doc/library/argparse.rst

@@ -365,8 +365,8 @@ newlines.
 
 :class:`FlexiHelpFormatter` wraps description and help text like the default
 formatter, while preserving paragraphs and supporting bulleted lists. Bullet
-list items are marked by the use of the "*", "-", "+", or ">" characters, or a
-single non-whitespace character followed by a "."::
+list items are recognized by markers such as "*", "-", "+", or ">" characters, or 
+by alphanumeric sequences followed by "." or ")" (e.g. 1., a), iv.)::
 
    >>> parser = argparse.ArgumentParser(
    ...     prog='PROG',