Docserver: Fix apps GitHub example links.

R=miket@chromium.org

Review URL: https://codereview.chromium.org/73383002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235265 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235265