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>

Documentation/cpu-freq/governors.txt

@@ -57,7 +57,7 @@ selected for each specific use.
 
 Basically, it's the following flow graph:
 
-CPU can be set to switch independetly	 |	   CPU can only be set
+CPU can be set to switch independently	 |	   CPU can only be set
       within specific "limits"		 |       to specific frequencies
 
                                  "CPUfreq policy"