Fix up comment

Co-authored-by: Victor Stinner <vstinner@python.org>

Author: StanFromIreland

.github/workflows/reusable-san.yml

@@ -90,8 +90,9 @@ jobs:
         --openssl="${OPENSSL_VER}"
         --system=Linux
         --tsan
-    # -O0 instead of the pydebug default -Og to avoid a clang 21 compile-time
-    # blowup on some interpreter files (https://github.com/llvm/llvm-project/issues/179695)
+    # gh-157958: -O2 instead of the pydebug default -Og to avoid a clang 21
+    # compile-time blowup on some interpreter files.
+    # (https://github.com/llvm/llvm-project/issues/179695)
     - name: Configure CPython
       run: >-
         ./configure