Improve markupEnabled documentation on supported tags
Improve markupEnabled documentation on supported tags

Closes https://github.com/eclipsesource/tabris-js/issues/1242

Change-Id: I1bbb8ef76baea75f0131bf10fff00bc3cc8f74d9

eclipsesource/tabris-js,eclipsesource/tabris-js,eclipsesource/tabris-js