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/networking/fib_trie.txt b/Documentation/networking/fib_trie.txt
index f50d0c6..0723db7 100644
--- a/Documentation/networking/fib_trie.txt
+++ b/Documentation/networking/fib_trie.txt
@@ -79,7 +79,7 @@
 
 resize()
 	Analyzes a tnode and optimizes the child array size by either inflating
-	or shrinking it repeatedly until it fullfills the criteria for optimal
+	or shrinking it repeatedly until it fulfills the criteria for optimal
 	level compression. This part follows the original paper pretty closely
 	and there may be some room for experimentation here.