Renamed README.md to index.md in federation/api-reference.

Corrected link on Guides TOC.
Corrected duplicate title in federation/api-reference/index.md.

_data/guides.yml

@@ -213,7 +213,7 @@ toc:
     - docs/user-guide/federation/namespaces.md
     - docs/user-guide/federation/replicasets.md
     - docs/user-guide/federation/secrets.md
-    - docs/federation/api-reference/README.md
+    - docs/federation/api-reference/index.md
   - title: Federation Components
     section:
     - docs/admin/federation-apiserver.md

docs/federation/api-reference/index.md

@@ -1,9 +1,7 @@
 ---
-title: Federation API
+title: Federation API Reference
 ---
 
-# API Reference
-
 Federation API server supports the following group versions:
 
 * federation/v1beta1: [operations](/docs/federation/api-reference/federation/v1beta1/operations.html), [model definitions](/docs/federation/api-reference/federation/v1beta1/definitions.html)