Added info on browsing git on the web

git-svn-id: https://svn.apache.org/repos/asf/flex/site/trunk@1467968 13f79535-47bb-0310-9956-ffa450edef68
Added info on browsing git on the web

git-svn-id: https://svn.apache.org/repos/asf/flex/site/trunk@1467970 13f79535-47bb-0310-9956-ffa450edef68