docs(script): add more detailed information

Closes angular#5671
Closes angular#5676

Author: Gias Kay Lee

src/ng/directive/script.js

@@ -6,10 +6,14 @@
  * @restrict E
  *
  * @description
- * Load content of a script tag, with type `text/ng-template`, into `$templateCache`, so that the
- * template can be used by `ngInclude`, `ngView` or directive templates.
+ * Load the content of a `<script>` element into {@link api/ng.$templateCache `$templateCache`}, so that the
+ * template can be used by {@link api/ng.directive:ngInclude `ngInclude`},
+ * {@link api/ngRoute.directive:ngView `ngView`}, or {@link guide/directive directives}. The type of the
+ * `<script>` element must be specified as `text/ng-template`, and a cache name for the template must be
+ * assigned through the element's `id`, which can then be used as a directive's `templateUrl`.
  *
- * @param {'text/ng-template'} type must be set to `'text/ng-template'`
+ * @param {'text/ng-template'} type Must be set to `'text/ng-template'`.
+ * @param {string} id Cache name of the template.
  *
  * @example
   <doc:example>