Update connector-ch.md

modify some Restful error

documentation20/webdocs/markdowndocs/connector-ch.md

@@ -846,7 +846,7 @@ curl http://192.168.0.1:6041/rest/login/root/taosdata
 - 在demo库里查询表d1001的所有记录： 
 
 ```
-curl -H 'Authorization: Basic cm9vdDp0YW9zZGF0YQ==' -d 'select * from demo.d1001' 192.168.0.1:6041/rest/sql`
+curl -H 'Authorization: Basic cm9vdDp0YW9zZGF0YQ==' -d 'select * from demo.d1001' 192.168.0.1:6041/rest/sql
 ```
 返回值：
 
@@ -865,7 +865,7 @@ curl -H 'Authorization: Basic cm9vdDp0YW9zZGF0YQ==' -d 'select * from demo.d1001
 - 创建库demo：
 
 ```
-curl -H 'Authorization: Basic cm9vdDp0YW9zZGF0YQ==' -d 'create database demo' 192.168.0.1:6041/rest/sql`
+curl -H 'Authorization: Basic cm9vdDp0YW9zZGF0YQ==' -d 'create database demo' 192.168.0.1:6041/rest/sql
 ```
 
 返回值：