Update stats-api-playground.md

Author: metmarkosaric

docs/stats-api-playground.md

@@ -1,13 +1,13 @@
 ---
-title: Stats API v2 playground
+title: Stats API playground
 ---
 
 import { ApiV2Playground, ExamplesTip } from '../src/js/apiv2-playground.tsx';
 import { SiteContextProvider } from '../src/js/sites.tsx';
 
 <SiteContextProvider>
   <ExamplesTip>
-    This is an interactive playground for building queries for [Stats API v2](/stats-api-v2).
+    This is an interactive playground for building queries for [Stats API](/stats-api-v2).
 
     The code below can be edited and run against your own data if you're logged in.
   </ExamplesTip>