Merge "Fix small issue in PdfDocument docs" into rvc-dev

 * // create a new document

 * PdfDocument document = new PdfDocument();

 *

 * // crate a page description

 * PageInfo pageInfo = new PageInfo.Builder(new Rect(0, 0, 100, 100), 1).create();

 * // create a page description

 * PageInfo pageInfo = new PageInfo.Builder(100, 100, 1).create();

 *

 * // start a page

 * Page page = document.startPage(pageInfo);