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>

net/sunrpc/xprtrdma/svc_rdma_sendto.c

@@ -54,7 +54,7 @@
  * Assumptions:
  * - head[0] is physically contiguous.
  * - tail[0] is physically contiguous.
- * - pages[] is not physically or virtually contigous and consists of
+ * - pages[] is not physically or virtually contiguous and consists of
  *   PAGE_SIZE elements.
  *
  * Output: