trivial: fix then -> than typos in comments and documentation

- (better, more, bigger ...) then -> (...) than

Signed-off-by: Frederik Schwarzer <schwarzerf@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

net/sctp/auth.c

@@ -141,8 +141,8 @@ void sctp_auth_destroy_keys(struct list_head *keys)
 /* Compare two byte vectors as numbers.  Return values
  * are:
  * 	  0 - vectors are equal
- * 	< 0 - vector 1 is smaller then vector2
- * 	> 0 - vector 1 is greater then vector2
+ * 	< 0 - vector 1 is smaller than vector2
+ * 	> 0 - vector 1 is greater than vector2
  *
  * Algorithm is:
  * 	This is performed by selecting the numerically smaller key vector...