Update for 'logduplicatelines' documentation.

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@8301 4b0bc96b-bc66-0410-9d44-ebda105a78c1
doc: Try to make description of "logduplicatelines" less confusing.

As the variable name says "logduplicatelines" enables logging
of duplicate lines in the log when this variable is set to 1.

By default the variable is set to 0 - duplicate lines are
not logged.

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@8302 4b0bc96b-bc66-0410-9d44-ebda105a78c1