[ARM] URL change for linux-on-laptops

Patch from: Sebastian Henschel

Attached is a cosmetic patch for arch/arm/Kconfig which updates the
URL for Kenneth's page and introduces the URL of tuxmobil.org.

arch/arm/Kconfig

@@ -439,9 +439,9 @@ config PM
 
 	  Power Management is most important for battery powered laptop
 	  computers; if you have a laptop, check out the Linux Laptop home
-	  page on the WWW at
-	  <http://www.cs.utexas.edu/users/kharker/linux-laptop/> and the
-	  Battery Powered Linux mini-HOWTO, available from
+	  page on the WWW at <http://www.linux-on-laptops.com/> or
+	  Tuxmobil - Linux on Mobile Computers at <http://www.tuxmobil.org/>
+	  and the Battery Powered Linux mini-HOWTO, available from
 	  <http://www.tldp.org/docs.html#howto>.
 
 	  Note that, even if you say N here, Linux on the x86 architecture