Fix broken link to DatePipe docs (#2452)

Fixes issue #2451

Author: jkjustjoshing

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

@@ -36,7 +36,7 @@ block includes
 
 :marked
   Inside the interpolation expression we flow the component's `birthday` value through the
-  [pipe operator](./template-syntax.html#pipe) ( | ) to the [Date pipe](../api/common/index/DatePipe-class.html)
+  [pipe operator](./template-syntax.html#pipe) ( | ) to the [Date pipe](../api/common/index/DatePipe-pipe.html)
   function on the right. All pipes work this way.
 
 .l-sub-section