Python: Update py/pam-auth-bypass change-note wording

Author: RasmusWL

python/ql/lib/change-notes/2022-11-17-py-pam-improve.md

@@ -1,4 +1,4 @@
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  category: majorAnalysis
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-* Converted `py/pam-auth-bypass` to a data-flow query, resulting in significantly lower false positives.
+* The _PAM authorization bypass due to incorrect usage_ (`py/pam-auth-bypass`) query has been converted to a tain-tracking query, resulting in significantly fewer false positives.