docs(ngTransclude): improve markup consistency

Closes #10298

src/ng/directive/ngTransclude.js

@@ -34,7 +34,7 @@
          }]);
        </script>
        <div ng-controller="ExampleController">
-         <input ng-model="title"><br>
+         <input ng-model="title"> <br/>
          <textarea ng-model="text"></textarea> <br/>
          <pane title="{{title}}">{{text}}</pane>
        </div>