[mkgmap-dev] Commit r4917: fix typos in documentation: $LONG_DATE$ -> $LONGDATE$, $SHORT_DATE$ -> $SHORTDATE$

Version mkgmap-r4917 was committed by gerd on Sun, 18 Feb 2024 fix typos in documentation: $LONG_DATE$ -> $LONGDATE$, $SHORT_DATE$ -> $SHORTDATE$ http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4917