Documentation/v2: update /health response

Signed-off-by: Gyu-Ho Lee <gyuhox@gmail.com>

Documentation/v2/admin_guide.md

@@ -45,12 +45,12 @@ It is important to monitor your production etcd cluster for healthy information
 
 #### Health Monitoring
 
-At lowest level, etcd exposes health information via HTTP at `/health` in JSON format. If it returns `{"health": "true"}`, then the cluster is healthy. Please note the `/health` endpoint is still an experimental one as in etcd 2.2.
+At lowest level, etcd exposes health information via HTTP at `/health` in JSON format. If it returns `{"health":true}`, then the cluster is healthy.
 
 ```
 $ curl -L http://127.0.0.1:2379/health
 
-{"health": "true"}
+{"health":true}
 ```
 
 You can also use etcdctl to check the cluster-wide health information. It will contact all the members of the cluster and collect the health information for you.

Documentation/v2/other_apis.md

@@ -29,5 +29,5 @@ curl http://10.0.0.10:2379/health
 ```
 
 ```json
-{"health": "true"}
+{"health":true}
 ```