Fix typos in Documentation/: 'H'-'M'

This patch fixes typos in various Documentation txts. The patch addresses
some words starting with the letters 'H'-'M'.

Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/Documentation/driver-model/class.txt b/Documentation/driver-model/class.txt
index 2d1d893..548505f 100644
--- a/Documentation/driver-model/class.txt
+++ b/Documentation/driver-model/class.txt
@@ -12,7 +12,7 @@
 
 Each device class defines a set of semantics and a programming interface
 that devices of that class adhere to. Device drivers are the
-implemention of that programming interface for a particular device on
+implementation of that programming interface for a particular device on
 a particular bus. 
 
 Device classes are agnostic with respect to what bus a device resides