sync-webkit-git: link to wiki, do some of Tony's review comments

I had committed before I got Tony's feedback.  This change does
some of his suggestions and migrates some info to the wiki.

Review URL: http://codereview.chromium.org/195098

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@26286 0039d316-1c4b-4281-b951-d872f2087c98