tree-wide: Assorted spelling fixes

In particular, several occurances of funny versions of 'success',
'unknown', 'therefore', 'acknowledge', 'argument', 'achieve', 'address',
'beginning', 'desirable', 'separate' and 'necessary' are fixed.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Joe Perches <joe@perches.com>
Cc: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/isdn/i4l/isdn_common.c b/drivers/isdn/i4l/isdn_common.c
index adb1e8c..00c60e2 100644
--- a/drivers/isdn/i4l/isdn_common.c
+++ b/drivers/isdn/i4l/isdn_common.c
@@ -1347,7 +1347,7 @@
 /*
  * isdn net devices manage lots of configuration variables as linked lists.
  * Those lists must only be manipulated from user space. Some of the ioctl's
- * service routines access user space and are not atomic. Therefor, ioctl's
+ * service routines access user space and are not atomic. Therefore, ioctl's
  * manipulating the lists and ioctl's sleeping while accessing the lists
  * are serialized by means of a semaphore.
  */