refactor(ngModelOptions): fix ng-closure-runner warning

Without this fix `grunt minall` emits the following warning:
> WARNING - Parse error. Non-JSDoc comment has annotations.
> Did you mean to start it with '/**'?

Closes angular#16575

Author: gkalpak

src/ng/directive/ngModelOptions.js

@@ -41,7 +41,7 @@ ModelOptions.prototype = {
     options = extend({}, options);
 
     // Inherit options from the parent if specified by the value `"$inherit"`
-    forEach(options, /* @this */ function(option, key) {
+    forEach(options, /** @this */ function(option, key) {
       if (option === '$inherit') {
         if (key === '*') {
           inheritAll = true;