tree-wide: fix assorted typos all over the place

That is "success", "unknown", "through", "performance", "[re|un]mapping"
, "access", "default", "reasonable", "[con]currently", "temperature"
, "channel", "[un]used", "application", "example","hierarchy", "therefore"
, "[over|under]flow", "contiguous", "threshold", "enough" and others.

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/isdn/i4l/isdn_ttyfax.c b/drivers/isdn/i4l/isdn_ttyfax.c
index 78f7660..4c41f19 100644
--- a/drivers/isdn/i4l/isdn_ttyfax.c
+++ b/drivers/isdn/i4l/isdn_ttyfax.c
@@ -470,7 +470,7 @@
 		}
 		return 0;
 	}
-	/* BADMUL=value - dummy 0=disable errorchk disabled (treshold multiplier) */
+	/* BADMUL=value - dummy 0=disable errorchk disabled (threshold multiplier) */
 	if (!strncmp(p[0], "BADMUL", 6)) {
 		p[0] += 6;
 		switch (*p[0]) {