Documentation: update URLs for Richard Gooch's articles

Current URL for "Kernel API changes from 2.0 to 2.2" hasn't been available
for some time, updating. The second article about changes from 2.2 to 2.4
is missing a URL, adding it.
Signed-off-by: NLuis de Bethencourt <luisbg@osg.samsung.com>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/kernel-docs.txt

@@ -266,14 +266,14 @@
 
      * Title: "Kernel API changes from 2.0 to 2.2"
        Author: Richard Gooch.
-       URL:
-       http://www.linuxhq.com/guides/LKMPG/node28.html 
+       URL: http://www.safe-mbox.com/~rgooch/linux/docs/porting-to-2.2.html
        Keywords: 2.2, changes.
        Description: Kernel functions/structures/variables which changed
        from 2.0.x to 2.2.x.
 
      * Title: "Kernel API changes from 2.2 to 2.4"
        Author: Richard Gooch.
+       URL: http://www.safe-mbox.com/~rgooch/linux/docs/porting-to-2.4.html
        Keywords: 2.4, changes.
        Description: Kernel functions/structures/variables which changed
        from 2.2.x to 2.4.x.