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>

drivers/char/pty.c

@@ -220,7 +220,7 @@ static void pty_set_termios(struct tty_struct *tty,
  *	@tty: tty being resized
  *	@ws: window size being set.
  *
- *	Update the termios variables and send the neccessary signals to
+ *	Update the termios variables and send the necessary signals to
  *	peform a terminal resize correctly
  */