Merge pull request #2039 from wojiushixiaobai/docs

[Update]更新负载模式

docs/distributed_02.rst

@@ -86,7 +86,7 @@
             server 192.168.100.40:2222 weight=1;
             server 192.168.100.40:2223 weight=1;  # 多节点
             # 这里是 coco ssh 的后端ip
-            least_conn;
+            hash $remote_addr;
         }
         server {
             listen 2222;

docs/setup_by_centos7.rst

@@ -262,7 +262,7 @@ CentOS 7 安装文档
             server localhost:2222 weight=1;
             server localhost:2223 weight=1;  # 多节点
             # 这里是 coco ssh 的后端ip
-            least_conn;  # 优先连接连接数最少的后端服务
+            hash $remote_addr;
         }
         server {
             listen 2222;