Update change note to reflect Python 2 changes

Author: tausbn

python/ql/lib/change-notes/2025-12-09-python-support-relaxed-except-syntax.md

@@ -1,4 +1,4 @@
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 category: feature
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-* The extractor now supports the new, relaxed syntax `except A, B, C: ...` (which would previously have to be written as `except (A, B, C): ...`) as defined in [PEP-758](https://peps.python.org/pep-0758/).
+* The extractor now supports the new, relaxed syntax `except A, B, C: ...` (which would previously have to be written as `except (A, B, C): ...`) as defined in [PEP-758](https://peps.python.org/pep-0758/). This may cause changes in results for code that uses Python 2-style exception binding (`except Foo, e: ...`). The more modern format, `except Foo as e: ...` (available since Python 2.6) is unaffected.