Drop punctuation

Co-authored-by: Sumana Harihareswara <sh@changeset.nyc>

NEWS.rst

@@ -93,7 +93,7 @@ Improved Documentation
 - Fix pip config docstring so that the subcommands render correctly in the docs (`#8072 <https://github.com/pypa/pip/issues/8072>`_)
 - replace links to the old pypa-dev mailing list with https://mail.python.org/mailman3/lists/distutils-sig.python.org/ (`#8353 <https://github.com/pypa/pip/issues/8353>`_)
 - Fix example for defining multiple values for options which support them (`#8373 <https://github.com/pypa/pip/issues/8373>`_)
-- Add documentation for the ResolutionImpossible error, that helps the user fix dependency conflicts (`#8459 <https://github.com/pypa/pip/issues/8459>`_)
+- Add documentation for the ResolutionImpossible error that helps the user fix dependency conflicts (`#8459 <https://github.com/pypa/pip/issues/8459>`_)
 - Add feature flags to docs (`#8512 <https://github.com/pypa/pip/issues/8512>`_)
 - Document how to install package extras from git branch and source distributions. (`#8576 <https://github.com/pypa/pip/issues/8576>`_)