Cosmetic: Fix a number of typos, no functional changes.

Fix various misspellings of things like "environment", "kernel",
"default" and "volatile", and throw in a couple grammar fixes.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
index 5936f9b..60ed92d 100644
--- a/drivers/net/phy/smsc.c
+++ b/drivers/net/phy/smsc.c
@@ -7,7 +7,7 @@
  *   Copyright 2010-2011 Freescale Semiconductor, Inc.
  *   author Andy Fleming
  *
- * Some code get from linux kenrel
+ * Some code copied from linux kernel
  * Copyright (c) 2006 Herbert Valerio Riedel <hvr@gnu.org>
  */
 #include <miiphy.h>