docs(input[week]): add id to input element to fix e2e test

Author: petebacondarwin

src/ng/directive/input.js

@@ -443,7 +443,7 @@ var inputType = {
       </script>
       <form name="myForm" ng-controller="DateController as dateCtrl">
         <label>Pick a date between in 2013:
-          <input type="week" name="input" ng-model="example.value"
+          <input id="exampleInput" type="week" name="input" ng-model="example.value"
                  placeholder="YYYY-W##" min="2012-W32"
                  max="2013-W52" required />
         </label>