fix Discussions-To header

Author: adqm

peps/pep-0798.rst

@@ -2,7 +2,7 @@ PEP: 798
 Title: Unpacking in Comprehensions
 Author: Adam Hartz <hz@mit.edu>, Erik Demaine <edemaine@mit.edu>
 Sponsor: Jelle Zijlstra <jelle.zijlstra at gmail.com>
-Discussions-To: `Discourse thread <https://discuss.python.org/t/99435>`__
+Discussions-To: https://discuss.python.org/t/99435
 Status: Draft
 Type: Standards Track
 Created: 19-Jul-2025