docs(guide/Directives): use more standard data-ng-model in example

Yi EungJun · petebacondarwin · commit 80b9018f2911 · 2015-06-01T07:59:05.000+01:00
Use data-ng-model instead of data-ng:model which is accepted for legacy reason. The next "Normalization" section is saying: > Best Practice: Prefer using the dash-delimited format (e.g. ng-bind for > ngBind). If you want to use an HTML validating tool, you can instead use the > data-prefixed version (e.g. data-ng-bind for ngBind). The other forms > shown above are accepted for legacy reasons but we advise you to avoid > them. Closes angular#11960
diff --git a/docs/content/guide/directive.ngdoc b/docs/content/guide/directive.ngdoc
@@ -51,7 +51,7 @@ In the following example, we say that the `<input>` element **matches** the `ngM
 The following also **matches** `ngModel`:
 
 ```html
-<input data-ng:model="foo">
+<input data-ng-model="foo">
 ```
 
 ### Normalization
