fix release notes URL, small regression from bug 232011, now this uses the XUL preprocessor as well, r=bsmedberg (no sr needed)

xpfe/global/resources/locale/en-US/region.dtd

@@ -1,5 +1,5 @@
 <!-- brand.dtd -->
 <!ENTITY  vendorURL             "http://www.mozilla.org/">
-<!ENTITY  releaseURL            "http://www.mozilla.org/releases/mozilla@MOZILLA_VERSION@">
+#expand <!ENTITY  releaseURL            "http://www.mozilla.org/releases/mozilla__MOZILLA_VERSION__">
 <!ENTITY  getNewThemesURL       "http://mozilla.org/themes/download/">
 #expand <!ENTITY  content.version       "__MOZILLA_REGION_VERSION__">