Fix markup

Author: warsaw

peps/pep-0772.rst

@@ -454,7 +454,7 @@ end, the authors will submit this PEP
      authors adding language to PEP 772 that explicitly gives the Packaging Council the authority to
      enforce the PSF Code of Conduct, in addition to enforcement mechanisms otherwise approved by
      the Foundation.**
-   - Requested language added in ``PR 4550 <https://github.com/python/peps/pull/4550/files>`_
+   - Requested language added in `PR 4550 <https://github.com/python/peps/pull/4550/files>`_.
 
 #. for a vote on the pypa-committers mailing list, in accordance with the process outlined in
    :pep:`609`