Fix misspellings collected by members of KJ list.

Fix the misspellings of "propogate", "writting" and (oh, the shame
:-) "kenrel" in the source tree.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 7710a6a..f6ac1d3 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1573,11 +1573,11 @@
 
 
 /**
- *	stop_tty	-	propogate flow control
+ *	stop_tty	-	propagate flow control
  *	@tty: tty to stop
  *
  *	Perform flow control to the driver. For PTY/TTY pairs we
- *	must also propogate the TIOCKPKT status. May be called
+ *	must also propagate the TIOCKPKT status. May be called
  *	on an already stopped device and will not re-call the driver
  *	method.
  *
@@ -1607,11 +1607,11 @@
 EXPORT_SYMBOL(stop_tty);
 
 /**
- *	start_tty	-	propogate flow control
+ *	start_tty	-	propagate flow control
  *	@tty: tty to start
  *
  *	Start a tty that has been stopped if at all possible. Perform
- *	any neccessary wakeups and propogate the TIOCPKT status. If this
+ *	any neccessary wakeups and propagate the TIOCPKT status. If this
  *	is the tty was previous stopped and is being started then the
  *	driver start method is invoked and the line discipline woken.
  *