Update router.jade

Author: wardbell

public/docs/ts/latest/guide/router.jade

@@ -1,10 +1,5 @@
 include ../_util-fns
 
-.alert.is-important
-  :marked
-    The Component Router is in beta release. This is the recommended Angular 2 router and supersedes
-    the earlier *deprecated beta* and *v2* routers.
-
 :marked
   The Angular ***Component Router*** enables navigation from one [view](./glossary.html#view) to the next
   as users perform application tasks.