docs(alint): add cve-identifier-formatted-incorrectly

it will be a catch-all for any problems with formatting stuff in CVEs
and will have equivalents in GNUTLS-SA, XSA, and others

alint.5.scd

@@ -463,3 +463,10 @@ while it most likely won't cause any problems it is considered good form
 to remove it.
 
 Severity: Minor, Certainty: Certain
+
+## cve-identifier-formatted-incorrectly [AL50]
+
+The CVE identifier is not formatted correctly, please check the output
+string for the reason why
+
+Severity: Minor, Certainty: Certain