update doc

docs/client/rest/rest_api.md

@@ -20,10 +20,13 @@
 Note that: now the api version is v1 and the base uri is `/api/v1`.
 
 ## Authentication
+
 REST API supports the [Basic Authentication](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Authorization#basic_authentication) which relies on `Authorization` header in HTTP request.
+
 ```
 Authorization: Basic <credentials>
 ```
+
 The `<credentials>` value is the Base64 encoded string of `username:password`. For example,in the case of a user `aladdin` with the password `opensesame`, set the `Authorization` header to `Basic YWxhZGRpbjpvcGVuc2VzYW1l` as Base64 encoded `aladdin:opensesame`.
 
 ## Session Resource