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/examples/standalone/README.smc91111_eeprom b/examples/standalone/README.smc91111_eeprom
index 28e7e69..a2d52e7 100644
--- a/examples/standalone/README.smc91111_eeprom
+++ b/examples/standalone/README.smc91111_eeprom
@@ -154,10 +154,10 @@
 
 -Boot environmental variable in Flash <- can not change, without
 					  re-flashing U-boot.
-U-Boot environental variable	       <- can not change, without
+U-Boot environmental variable	       <- can not change, without
 					  resetting board/U-Boot
-LAN91C111 Registers		       <- volitle
-LAN91C111 EEPROM		       <- Non Volitle
+LAN91C111 Registers		       <- volatile
+LAN91C111 EEPROM		       <- Non-volatile
 
 If you have not activated the network, and do not have a hardcoded
 or pre-assigned MAC address in U-boot, the environmental variables