docs(ngBind): irrelevant text removed from ngBindHtml’s example

The ngBindHtml’s example had a copied line from ngBindTemplate’s that’s irrelevant here.

Closes #8668

src/ng/directive/ngBind.js

@@ -150,7 +150,6 @@ var ngBindTemplateDirective = ['$interpolate', function($interpolate) {
  * @param {expression} ngBindHtml {@link guide/expression Expression} to evaluate.
  *
  * @example
-   Try it here: enter text in text box and watch the greeting change.
 
    <example module="bindHtmlExample" deps="angular-sanitize.js">
      <file name="index.html">