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/sound/sparc/dbri.c b/sound/sparc/dbri.c
index 25a2a73..e07085a 100644
--- a/sound/sparc/dbri.c
+++ b/sound/sparc/dbri.c
@@ -673,7 +673,7 @@
 }
 
 /*
- * Send prepared cmd string. It works by writting a JUMP cmd into
+ * Send prepared cmd string. It works by writing a JUMP cmd into
  * the last WAIT cmd and force DBRI to reread the cmd.
  * The JUMP cmd points to the new cmd string.
  * It also releases the cmdlock spinlock.