rewrite description

Author: toufik-airane

javascript/ql/src/experimental/Security/CWE-347/JWTMissingSecretOrPublicKeyVerification.help

@@ -10,7 +10,7 @@ to critical security issues like privilege escalation.</p>
 </overview>
 
 <recommendation>
-<p>Call to <code>verify()</code> functions should use a cryptographic secret or key to decode JWT payloads</p>
+<p>Call to <code>verify()</code> functions should use a cryptographic secret or key to decode JWT payloads.</p>
 
 </recommendation>