Clarify that the `crd` endpoints returns a `CrdInfo`

While this is straight forward, explicitly stating it brings the docs
more in-line with Gerrit documentation, where each endpoint also
declares the returned entity also in text.

Change-Id: Iaf1ab426e1b37b2e41cf4d740539e9eb21ff3867
diff --git a/src/main/resources/Documentation/rest-api-changes.md b/src/main/resources/Documentation/rest-api-changes.md
index 69c20d1..fc80eb3 100644
--- a/src/main/resources/Documentation/rest-api-changes.md
+++ b/src/main/resources/Documentation/rest-api-changes.md
@@ -24,6 +24,8 @@
   GET /changes/myProject~master~I8473b95934b5732ac55d26311a706c9c2bde9940/revisions/674ac754f91e64a0efb8087e59a176484bd534d1/crd HTTP/1.0
 ```
 
+As response a [CrdInfo](#crd-info) entity is returned that describes the cross-repository dependencies.
+
 #### Response
 
 ```