releasing: Mention dual release announcements

releasing.txt

@@ -22,13 +22,14 @@ To make a release of Weston and/or Wayland, follow these steps.
       skip testsuite by specifying the --dist argument.  Pass --help to
       see other supported options.
 
-  3.  Compose a release announcement.  The script will generate a
+  3.  Compose the release announcements.  The script will generate
-      weston.x.y.0.announce file with a list of changes and tags.
+      *.x.y.0.announce files with a list of changes and tags, one for
-      Prepend this with a human-readable listing of the most notable
+      wayland, one for weston.  Prepend these with a human-readable
-      changes.  For x.y.0 releases, indicate the schedule for the
+      listing of the most notable changes.  For x.y.0 releases, indicate
-      x.y+1.0 release.
+      the schedule for the x.y+1.0 release.
-
+
-  4.  Send the release announcement to wayland-devel@lists.freedesktop.org
+  4.  Send the release announcements to
+      wayland-devel@lists.freedesktop.org
 
   5.  Get your freshly posted release email URL from
       http://lists.freedesktop.org/archives/wayland-devel/