[MSKINS-78] Do not generate line with doxia timestamp.

git-svn-id: https://svn.apache.org/repos/asf/maven/skins/trunk@1448934 13f79535-47bb-0310-9956-ffa450edef68
[MSKINS-78]  document the change

git-svn-id: https://svn.apache.org/repos/asf/maven/skins/trunk@1448935 13f79535-47bb-0310-9956-ffa450edef68