docs(ngInclude): add workaround for using onload function with SVG in IE11

Closes angular#12493
Closes angular#13042

Author: kutyel

src/ng/directive/ngInclude.js

@@ -34,7 +34,13 @@
  * @param {string} ngInclude|src angular expression evaluating to URL. If the source is a string constant,
  *                 make sure you wrap it in **single** quotes, e.g. `src="'myPartialTemplate.html'"`.
  * @param {string=} onload Expression to evaluate when a new partial is loaded.
- *
+ *                  <div class="alert alert-warning">
+ *                  **Note:** When using onload on SVG elements in IE11, the browser will try to call
+ *                  a function with the name on the window element, which will usually throw a
+ *                  "function is undefined" error. To fix this, you can instead use `data-onload` or a
+ *                  different form that {@link guide/directives#normalization matches} `onload`.
+ *                  </div>
+   *
  * @param {string=} autoscroll Whether `ngInclude` should call {@link ng.$anchorScroll
  *                  $anchorScroll} to scroll the viewport after the content is loaded.
  *