ruby: drop a redundant bit of documentation

Author: alexrford

ruby/ql/src/queries/security/cwe-352/CSRFProtectionDisabled.qhelp

@@ -7,8 +7,7 @@
     <p>
       Cross-site request forgery (CSRF) is a type of vulnerability in which an
       attacker is able to force a user carry out an action that the user did
-      not intend. This may allow the attacker to perform actions on behalf of
-      the targeted user.
+      not intend.
     </p>
 
     <p>