docs(ngOpen): add note about browser compatibility

- Add note about browser compatibility and recommend ng-show/ng-hide

Closes angular#14752

Author: wesleycho

src/ng/directive/attrs.js

@@ -305,6 +305,11 @@
  * A special directive is necessary because we cannot use interpolation inside the `open`
  * attribute. See the {@link guide/interpolation interpolation guide} for more info.
  *
+ * ## A note about browser compatibility
+ *
+ * Edge, Firefox, and Internet Explorer do not support the `details` element, it is
+ * recommended to use {@link ng.ngShow} and {@link ng.ngHide} instead.
+ *
  * @example
      <example>
        <file name="index.html">