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/block/deadline-iosched.txt b/Documentation/block/deadline-iosched.txt
index 672c06b..be08ffd 100644
--- a/Documentation/block/deadline-iosched.txt
+++ b/Documentation/block/deadline-iosched.txt
@@ -27,7 +27,7 @@
 service time for a request. As we focus mainly on read latencies, this is
 tunable. When a read request first enters the io scheduler, it is assigned
 a deadline that is the current time + the read_expire value in units of
-miliseconds.
+milliseconds.
 
 
 write_expire	(in ms)