[SECURITY-420] Remove obsolete comments

core/src/main/java/hudson/model/Hudson.java

@@ -172,7 +172,7 @@ public class Hudson extends Jenkins {
      *      Use {@link #doQuietDown()} instead.
      */
     @Deprecated
-    @RequirePOST // Shouldn't be used anyway, but better be safe
+    @RequirePOST
     public synchronized void doQuietDown(StaplerResponse rsp) throws IOException, ServletException {
         doQuietDown().generateResponse(null, rsp, this);
     }

core/src/main/java/jenkins/model/Jenkins.java

@@ -2990,7 +2990,7 @@ public class Jenkins extends AbstractCIBase implements DirectlyModifiableTopLeve
         getPrimaryView().doSubmitDescription(req, rsp);
     }
 
-    @RequirePOST // TODO does not seem to work on _either_ overload!
+    @RequirePOST
     public synchronized HttpRedirect doQuietDown() throws IOException {
         try {
             return doQuietDown(false,0);