Tweak wording.  Refer to new section of PROBLEMS file on current issues with unicode fonts.
Tweak wording.  Refer to new section of PROBLEMS file on current issues with
unicode fonts.

svn path=/trunk/; revision=6124

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot