Correctly a typo and added a few sentences on new devices available/tested for Windows/Cygwin.
Correctly a typo and added a few sentences on new devices available/tested for Windows/Cygwin.

svn path=/trunk/; revision=12892

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