Merge "Update docs to say onPageStarted is not called for fragment navigations."

     * is called once for each main frame load so a page with iframes or

     * framesets will call onPageStarted one time for the main frame. This also

     * means that onPageStarted will not be called when the contents of an

     * embedded frame changes, i.e. clicking a link whose target is an iframe.

     * embedded frame changes, i.e. clicking a link whose target is an iframe,

     * it will also not be called for fragment navigations (navigations to

     * #fragment_id).

     *

     * @param view The WebView that is initiating the callback.

     * @param url The url to be loaded.