Fix UVVU URL

Author: palemieux

imsc1/spec/ttml-ww-profiles.html

@@ -63,7 +63,7 @@
                           },
                           "CFF": {
                           publisher: "Digital Entertainment Content Ecosystem (DECE)",
-                          href: "https://www.uvcentral.com/specs",
+                          href: "https://www.uvcentral.com",
                           title:"Common File Format & Media Formats Specification (CFF) Version 2.2"
                           },
                           "EBU-TT-D": {