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/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
index 7f9c83a..3b2c98f 100644
--- a/drivers/scsi/pm8001/pm8001_sas.c
+++ b/drivers/scsi/pm8001/pm8001_sas.c
@@ -600,7 +600,7 @@
   * by the command "OPC_INB_REG_DEV", after that the HBA will assign a
   * device ID(according to device's sas address) and returned it to LLDD. From
   * now on, we communicate with HBA FW with the device ID which HBA assigned
-  * rather than sas address. it is the neccessary step for our HBA but it is
+  * rather than sas address. it is the necessary step for our HBA but it is
   * the optional for other HBA driver.
   */
 static int pm8001_dev_found_notify(struct domain_device *dev)