Update my employer.

docs/internals/committers.txt

@@ -243,7 +243,7 @@ Karen Tracey
 .. _James Tauber: http://jtauber.com/
 
 `Alex Gaynor`_
-    Alex is a software engineer working at Rdio_. He found Django in 2007 and
+    Alex is a software engineer working at Rackspace_. He found Django in 2007 and
     has been addicted ever since he found out you don't need to write out your
     forms by hand. He has a small obsession with compilers.  He's contributed
     to the ORM, forms, admin, and other components of Django.
@@ -251,7 +251,7 @@ Karen Tracey
     Alex lives in San Francisco, CA, USA.
 
 .. _Alex Gaynor: http://alexgaynor.net
-.. _Rdio: http://rdio.com
+.. _Rackspace: http://www.rackspace.com
 
 `Simon Meers`_
     Simon discovered Django 0.96 during his Computer Science PhD research and