see thread in forums for details

git-svn-id: https://svn.code.sf.net/p/fhem/code/trunk@3389 2b470e98-0d58-463d-a4d8-8e2adae1ed80
added missing <br> in doku


git-svn-id: https://svn.code.sf.net/p/fhem/code/trunk@3390 2b470e98-0d58-463d-a4d8-8e2adae1ed80