Author: Thomas Broyer <t.broyer@gmail.com>

Link to TroubleshootingOOPHM instead of embedding in iframe.

code.google.com sends an X-Frame-Options: SAMEORIGIN header which prevents
the wiki page from loading in the iframe.

Fixes issue 7301

Change-Id: I5832ceba9c8dfbd4a6c8718876d0f3d6309bc79c
Review-Link: https://gwt-review.googlesource.com/#/c/1110/

Review by: unnurg@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@11349 8db76d5a-ed1c-0410-87a9-c151d255dfc7