docs(guide): add notes about using ngAttr for IE

- Add note about using the value attribute for the progress tag with IE in the IE compat / interpolation guide
- Add note about placeholder attribute in textarea to the ie compat guide

Closes #7218
PR (#14753)

Author: wesleycho

Diff for: docs/content/guide/ie.ngdoc

@@ -29,6 +29,13 @@ 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).
-2. For the `type` attribute of buttons, use `ng-attr-type` tags instead of 
-   `type="{{ someExpression }}"`.  If using the latter, Internet Explorer overwrites the expression
+2. For the `type` attribute of buttons, use `ng-attr-type` tags instead of
+   `type="{{ someExpression }}"`. If using the latter, Internet Explorer overwrites the expression
    with `type="submit"` before Angular has a chance to interpolate it.
+3. For the `value` attribute of progress, use `ng-attr-value` tags instead of
+   `value="{{ someExpression}}"`. If using the latter, Internet Explorer overwrites the expression
+   with `value="0"` before Angular has a chance to interpolate it.
+4. For the `placeholder` attribute of textarea, use `ng-attr-placeholder` tags instead
+   of `placeholder="{{ someExpression }}"`. If using the latter, Internet Explorer will error
+   on accessing the `nodeValue` on a parentless `TextNode` in Internet Explorer 10 & 11
+   (see [issue 5025](https://github.com/angular/angular.js/issues/5025)).

Diff for: docs/content/guide/interpolation.ngdoc

@@ -104,7 +104,7 @@ can be used with `ngAttr` instead. The following is a list of known problematic
 - **size** in `<select>` elements (see [issue 1619](https://github.com/angular/angular.js/issues/1619))
 - **placeholder** in `<textarea>` in Internet Explorer 10/11 (see [issue 5025](https://github.com/angular/angular.js/issues/5025))
 - **type** in `<button>` in Internet Explorer 11 (see [issue 14117](https://github.com/angular/angular.js/issues/5025))
-
+- **value** in `<progress>` in Internet Explorer = 11 (see [issue 7218](https://github.com/angular/angular.js/issues/7218))
 
 ### Embedding interpolation markup inside expressions