plotter: BarPlot: Add docstring for BarPlot
plotter: BarPlot: Add docstring for BarPlot

Change-Id: I0d15054a3f81efd4011696cc049711085431dad1

sinkap/trappy,JaviMerino/trappy,joelagnel/trappy,sinkap/trappy,bjackman/trappy,joelagnel/trappy,joelagnel/trappy,sinkap/trappy,JaviMerino/trappy,bjackman/trappy,joelagnel/trappy,JaviMerino/trappy,ARM-software/trappy,ARM-software/trappy,sinkap/trappy,ARM-software/trappy,ARM-software/trappy,bjackman/trappy,bjackman/trappy