[mkgmap-dev] Commit r4094: improve documentation about default for --levels: Mention that the default style overwrites the hard coded default.

Version mkgmap-r4094 was committed by gerd on Tue, 30 Jan 2018 improve documentation about default for --levels: Mention that the default style overwrites the hard coded default. http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4094