Give slightly more detail in change note

Author: owen-mc

actions/ql/lib/change-notes/2026-05-12-improved-alphanumeric-regex.md

@@ -1,4 +1,4 @@
 ---
 category: minorAnalysis
 ---
-* The GitHub Actions analysis now recognizes more Bash regex checks that restrict a value to alphanumeric characters. This may reduce false positive results where command output is validated with grouped or optional alphanumeric patterns before being used.
+* The GitHub Actions analysis now recognizes more Bash regex checks that restrict a value to alphanumeric characters, include regexes like `^[0-9a-zA-Z]{40}([0-9a-zA-Z]{24})?$` which check for a sha1 or sha256 hash. This may reduce false positive results where command output is validated with grouped or optional alphanumeric patterns before being used.