Added usage in LOFAR.

libraries/dsp/st/doc/st_histogram.txt

@@ -111,6 +111,10 @@ b) On hardware
    - on a PC use a new Python script to read the histogram values and plot them.
    - on a PC use an existing Python script to control the WG.
    
+c) Use in LOFAR
+   - extend (wrap) the st_histogram component into an array variant such that it can be used in
+     a LOFAR FPGA design to monitor the histograms of 12 ADC inputs
+   
 
 
 5) References