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/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c
index a6b4a5a..f511e70 100644
--- a/drivers/parisc/ccio-dma.c
+++ b/drivers/parisc/ccio-dma.c
@@ -650,7 +650,7 @@
  * Mark the I/O Pdir entries invalid and blow away the corresponding I/O
  * TLB entries.
  *
- * FIXME: at some threshhold it might be "cheaper" to just blow
+ * FIXME: at some threshold it might be "cheaper" to just blow
  *        away the entire I/O TLB instead of individual entries.
  *
  * FIXME: Uturn has 256 TLB entries. We don't need to purge every