Added attribution for PR #460

Author: agronholm

docs/versionhistory.rst

@@ -7,7 +7,7 @@ This library adheres to
 **UNRELEASED**
 
 - Fixed some compatibility problems when running on Python 3.13
-  (`#460 <https://github.com/agronholm/typeguard/issues/460>`_)
+  (`#460 <https://github.com/agronholm/typeguard/issues/460>`_; PR by @JelleZijlstra)
 - Fixed test suite incompatibility with pytest 8.2
   (`#461 <https://github.com/agronholm/typeguard/issues/461>`_)