Merge "Fix javadoc xrefs." into pi-dev

     * Feature to delete an individual document. Quick viewer implementations must use

     * Storage Access Framework to both verify delete permission and to delete content.

     *

     * @see DocumentsContract#Document#FLAG_SUPPORTS_DELETE

     * @see DocumentsContract#deleteDocument(ContentResolver resolver, Uri documentUri)

     * @see DocumentsContract.Document#FLAG_SUPPORTS_DELETE

     * @see DocumentsContract#deleteDocument(ContentResolver, Uri)

     */

    public static final String FEATURE_DELETE = "android:delete";