fix demo bug in HTTP doc (fix #1634) (#1640)

Signed-off-by: NYhz <yinghao.zou@zilliz.com>

CHANGELOG.md

@@ -5,6 +5,7 @@ Please mark all change in change log and use the issue from GitHub
 # Milvus 0.7.1 (TBD)
 
 ## Bug
+-   \#1634 Fix search demo bug in HTTP doc
 -   \#1635 Vectors can be returned by searching after vectors deleted if `cache_insert_data` set true
 
 ## Feature

core/src/server/web_impl/README.md

@@ -1145,7 +1145,7 @@ $ curl -X GET "http://127.0.0.1:19121/collections/test_collection/segments/15837
 ##### Request
 
 ```shell
-$ curl -X PUT "http://127.0.0.1:19121/collections/test_collection/vectors" -H "accept: application/json" -H "Content-Type: application/json" -d "{\"topk\":2,\"vectors\":[[0.1]], \"params\":{\"nprobe\":16}}"
+$ curl -X PUT "http://127.0.0.1:19121/collections/test_collection/vectors" -H "accept: application/json" -H "Content-Type: application/json" -d "{\"search\":{\"topk\":2,\"vectors\":[[0.1]], \"params\":{\"nprobe\":16}}}"
 ```
 
 ##### Response
@@ -1388,7 +1388,7 @@ $ curl -X GET "http://127.0.0.1:19121/system/version" -H "accept: application/js
 ##### Response
 
 ```json
-{ "reply": "0.7.0" }
+{"code":0,"message":"OK","reply": "0.7.0" }
 ```
 
 ### `system/{op}` (PUT)