[RELEASING] Add ftp-release@lists.freedesktop.org

That list is monitored by various distros to pick up new releases.
We should CC release announcements there.

RELEASING

@@ -111,12 +111,12 @@ Here are the steps to follow to create a new cairo release:
    odd micro version).
 
 10) Send a message to cairo-announce@cairographics.org and CC
-    gnome-announce-list@gnome.org, (pr@lwn.net as well for major
-    releases) to announce the new release using the text provided from
-    "make release-publish", adding the excerpt from NEWS, your
-    signature, followed by the standard "What is cairo" and "Where to
-    get more information about cairo" blurbs from README, and finally
-    the shortlog of all changes since last release, generated by:
+    gnome-announce-list@gnome.org and ftp-release@lists.freedesktop.org
+    (pr@lwn.net as well for major releases) to announce the new release
+    using the text provided from "make release-publish", adding the excerpt
+    from NEWS, your signature, followed by the standard "What is cairo" and
+    "Where to get more information about cairo" blurbs from README, and
+    inally the shortlog of all changes since last release, generated by:
 
 	git shortlog X.Y.Z...