Document REST endpoint to retrieve a change with details

Document the '/changes/<change-id>/detail' REST endpoint.

Change-Id: I84d667be931e74cbabaca13f466649a826343bee
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

Documentation/rest-api-changes.txt

@@ -340,6 +340,131 @@ describes the change.
   }
 ----
 
+[[get-change-detail]]
+GET /changes/\{change-id\}/detail (Get Change Detail)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Retrieves a change with link:#labels[labels], link:#detailed-labels[
+detailed labels] and link:#detailed-accounts[detailed accounts].
+
+.Request
+----
+  GET /changes/myProject~master~I8473b95934b5732ac55d26311a706c9c2bde9940/detail HTTP/1.0
+----
+
+As response a link:#change-info[ChangeInfo] entity is returned that
+describes the change.
+
+.Response
+----
+  HTTP/1.1 200 OK
+  Content-Disposition: attachment
+  Content-Type: application/json;charset=UTF-8
+
+  )]}'
+  {
+    "kind": "gerritcodereview#change",
+    "id": "myProject~master~I8473b95934b5732ac55d26311a706c9c2bde9940",
+    "project": "myProject",
+    "branch": "master",
+    "change_id": "I8473b95934b5732ac55d26311a706c9c2bde9940",
+    "subject": "Implementing Feature X",
+    "status": "NEW",
+    "created": "2013-02-01 09:59:32.126000000",
+    "updated": "2013-02-21 11:16:36.775000000",
+    "reviewed": true,
+    "mergeable": true,
+    "_sortkey": "0023412400000f7d",
+    "_number": 3965,
+    "owner": {
+      "_account_id": 1000096,
+      "name": "John Doe",
+      "email": "john.doe@example.com"
+    },
+    "labels": {
+      "Verified": {
+        "all": [
+          {
+            "value": 0,
+            "_account_id": 1000096,
+            "name": "John Doe",
+            "email": "john.doe@example.com"
+          },
+          {
+            "value": 0,
+            "_account_id": 1000097,
+            "name": "Jane Roe",
+            "email": "jane.roe@example.com"
+          }
+        ],
+        "values": {
+          "-1": "Fails",
+          " 0": "No score",
+          "+1": "Verified"
+        }
+      },
+      "Code-Review": {
+        "recommended": {
+          "_account_id": 1000097,
+          "name": "Jane Roe",
+          "email": "jane.roe@example.com"
+        },
+        "disliked": {
+          "_account_id": 1000096,
+          "name": "John Doe",
+          "email": "john.doe@example.com"
+        },
+        "all": [
+          {
+            "value": -1,
+            "_account_id": 1000096,
+            "name": "John Doe",
+            "email": "john.doe@example.com"
+          },
+          {
+            "value": 1,
+            "_account_id": 1000097,
+            "name": "Jane Roe",
+            "email": "jane.roe@example.com"
+          }
+        ]
+        "values": {
+          "-2": "Do not submit",
+          "-1": "I would prefer that you didn\u0027t submit this",
+          " 0": "No score",
+          "+1": "Looks good to me, but someone else must approve",
+          "+2": "Looks good to me, approved"
+        }
+      }
+    },
+    "permitted_labels": {
+      "Verified": [
+        "-1",
+        " 0",
+        "+1"
+      ],
+      "Code-Review": [
+        "-2",
+        "-1",
+        " 0",
+        "+1",
+        "+2"
+      ]
+    },
+    "removable_reviewers": [
+      {
+        "_account_id": 1000096,
+        "name": "John Doe",
+        "email": "john.doe@example.com"
+      },
+      {
+        "_account_id": 1000097,
+        "name": "Jane Roe",
+        "email": "jane.roe@example.com"
+      }
+    ]
+  }
+----
+
 
 [[ids]]
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