docs(ngBindHtml): fix dependency for Plunker and JSFiddle in example
docs(ngBindHtml): fix dependency for Plunker and JSFiddle in example

The `<doc:example>` directive does not load up the dependencies correctly.
Using the `<example>` directive, with `<file>` elements fixes this.

Closes #4951

ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js