Merge pull request peterhinch#78 from fivdi/patch-1

iorw-py: fix typo in comment

Author: peterhinch

v3/as_demos/iorw.py

@@ -62,7 +62,7 @@ def ioctl(self, req, arg):  # see ports/stm32/uart.c
 
     # Test of device that produces one character at a time
     def readline(self):
-        self.ready_rd = False  # Cleared by timer cb do_input
+        self.ready_rd = False  # Set by timer cb do_input
         ch = self.rbuf[self.ridx]
         if ch == ord('\n'):
             self.ridx = 0