Added link to block diagram of WG in bn_filterbank FPGA.

applications/apertif/commissioning/tests/start_wg_at_bsn.sh

@@ -21,6 +21,11 @@
 
 # Author: Eric Kooistra
 # Purpose: Start WG synchronously at multiple dishes
+#
+#   For block diagram of the WG in the bn_filterbank FPGA see:
+#
+#    $RADIOHDL/applications/apertif/doc/schematics/apertif_fpga_firmware_unb1_fn_beamformer.pdf
+#
 # Usage:
 # 
 # At ccu-corr.