flow_control: configuration documentation

src/tools/flow_control.py

@@ -193,8 +193,10 @@ if __name__ == "__main__":
     
     Several parameters are printed on every execution
 
-    The default serial device is /dev/ttyUSB0. If oyu wnat to change that create a 
+    The default serial device is /dev/ttyUSB0. If you want to change that create a 
-    file calle "~/.flow" with the first line containing an alternate path, i.e. /dev/ttyUSB1
+    file called "~/.flow" with the first line containing an alternate path, i.e. /dev/ttyUSB1
+
+    If you want to enable debug output edit the script and set DEBUG=True.
     
     Sample output: