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/powerpc/hvcs.txt b/Documentation/powerpc/hvcs.txt
index 1e38166..f93462c 100644
--- a/Documentation/powerpc/hvcs.txt
+++ b/Documentation/powerpc/hvcs.txt
@@ -259,7 +259,7 @@
 
 It should be noted that due to the system hotplug I/O capabilities of a
 system the /dev/hvcs* entry that interacts with a particular vty-server
-adapter is not guarenteed to remain the same across system reboots.  Look
+adapter is not guaranteed to remain the same across system reboots.  Look
 in the Q & A section for more on this issue.
 
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