Documentation: HOWTO: Update broken links to tpp

Sites for 'The Perfect Patch' which described on HOWTO
document(kerneltrap.org and userweb.kernel.org) are down.
Change those links to the copy at ozlabs.
Signed-off-by: NSeongJae Park <sj38.park@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/HOWTO

@@ -112,7 +112,7 @@ required reading:
 
     Other excellent descriptions of how to create patches properly are:
 	"The Perfect Patch"
-		http://kerneltrap.org/node/3737
+		http://www.ozlabs.org/~akpm/stuff/tpp.txt
 	"Linux kernel patch submission format"
 		http://linux.yyz.us/patch-format.html
 
@@ -579,7 +579,7 @@ all time.  It should describe the patch completely, containing:
 For more details on what this should all look like, please see the
 ChangeLog section of the document:
   "The Perfect Patch"
-      http://userweb.kernel.org/~akpm/stuff/tpp.txt
+      http://www.ozlabs.org/~akpm/stuff/tpp.txt