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>

fs/jbd/transaction.c

@@ -1398,7 +1398,7 @@ int journal_stop(handle_t *handle)
 	 * the case where our storage is so fast that it is more optimal to go
 	 * ahead and force a flush and wait for the transaction to be committed
 	 * than it is to wait for an arbitrary amount of time for new writers to
-	 * join the transaction.  We acheive this by measuring how long it takes
+	 * join the transaction.  We achieve this by measuring how long it takes
 	 * to commit a transaction, and compare it with how long this
 	 * transaction has been running, and if run time < commit time then we
 	 * sleep for the delta and commit.  This greatly helps super fast disks