style(Angular.js): fix typo in comment

src/Angular.js

@@ -768,7 +768,7 @@ function shallowCopy(src, dst) {
 
   for(var key in src) {
     // shallowCopy is only ever called by $compile nodeLinkFn, which has control over src
-    // so we don't need to worry hasOwnProperty here
+    // so we don't need to worry about using our custom hasOwnProperty here
     if (src.hasOwnProperty(key) && key.substr(0, 2) !== '$$') {
       dst[key] = src[key];
     }