Updates the SafeHtml template creator to append template arguments individually rather than appending them in a single statement.  The current form was causing a JavaScript exception when invoking a template with a large number of arguments. Also fixes a small javadoc issue.

Review at http://gwt-code-reviews.appspot.com/1376801

Review by: jat@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9807 8db76d5a-ed1c-0410-87a9-c151d255dfc7