docs(a1-a2): fix link to Filter/Pipes (#2770)

Author: martineckardt

public/docs/ts/latest/cookbook/a1-a2-quick-reference.jade

@@ -77,7 +77,7 @@ table(width="100%")
         Many (but not all) of the built-in filters from Angular 1 are
         built-in pipes in Angular 2.
 
-        For more information, see the heading [Filters/pipes](#Pipes) below.
+        For more information, see the heading [Filters/pipes](#filters-pipes) below.
   tr(style=top)
     td
       :marked