[doc] updated experiments/plotters with --show option

doc/experiments.rst

@@ -119,3 +119,5 @@ There a two ways to plot data:
   $ ./bin/beat experiments plot experimentname
 
 In both cases the 'outputfolder' option can be specified to save all the plots to a specific directory. By default, if nothing was specified, the plots will be saved under the experiment path.
+
+Take into account that some extra options are available such as '--show' which will pop out the generated plots on your screen.

doc/plotters.rst

@@ -69,3 +69,4 @@ There a many ways to plot data:
 
   * The image gets saved under the plotter path with default name "output_image.png"
 
+Take into account that some extra options are available such as '--show' which will pop out the generated plots on your screen.