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

fix typo

Co-authored-by: intrigus-lgtm <60750685+intrigus-lgtm@users.noreply.github.com>

Author: porcupineyhairs

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

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