Improved documentation of plsxax, plsyax, plszax, plgxax, plgyax, and plgzax.
Improved documentation of plsxax, plsyax, plszax, plgxax, plgyax, and plgzax.

svn path=/trunk/; revision=3525

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