Fix typos in /Documentation : 'T''

This patch fixes typos in various Documentation txts. The patch addresses some
+words starting with the letter 'T'.

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/networking/pktgen.txt b/Documentation/networking/pktgen.txt
index c8eee23..7b35855 100644
--- a/Documentation/networking/pktgen.txt
+++ b/Documentation/networking/pktgen.txt
@@ -116,7 +116,7 @@
 					 there must be no spaces between the
 					 arguments. Leading zeros are required.
 					 Do not set the bottom of stack bit,
-					 thats done automatically. If you do
+					 that's done automatically. If you do
 					 set the bottom of stack bit, that
 					 indicates that you want to randomly
 					 generate that address and the flag