Remind users of plpause in plend documentation.  Thanks to David Sagan for this change.
Remind users of plpause in plend documentation.  Thanks to David Sagan for
this change.

svn path=/trunk/; revision=10606

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