docs(guide/Internet Explorer Compatibility): Add ng-attr-type workaround for buttons in IE

Resolves angular#14117

Author: SteveShaffer

docs/content/guide/ie.ngdoc

@@ -28,4 +28,7 @@ browsers, but it is up to you to test and decide whether it works for your parti
 To ensure your Angular application works on IE please consider:
 
 1. Use `ng-style` tags instead of `style="{{ someCss }}"`. The latter works in Chrome and Firefox
-   but does not work in Internet Explorer <= 11 (the most recent version at time of writing).
+   but does not work in Internet Explorer <= 11 (the most recent version at time of writing).
+2. For buttons, use `ng-attr-type` tags instead of `type="{{ someExpression }}"`.  
+   Internet Explorer overwrites the expression with `type="submit"` before Angular has a chance
+   to interpolate it.