Fix typos in Documentation/: 'F'-'G'

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

Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/Documentation/block/deadline-iosched.txt b/Documentation/block/deadline-iosched.txt
index c918b3a..672c06b 100644
--- a/Documentation/block/deadline-iosched.txt
+++ b/Documentation/block/deadline-iosched.txt
@@ -23,7 +23,7 @@
 read_expire	(in ms)
 -----------
 
-The goal of the deadline io scheduler is to attempt to guarentee a start
+The goal of the deadline io scheduler is to attempt to guarantee a start
 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