update client.md file naming-service demo machine list

docs/cn/client.md

@@ -93,10 +93,10 @@ BNS是百度内常用的命名服务，比如bns://rdev.matrix.all，其中"bns"
  * 当文件更新时, brpc会重新加载。
 ```
 # 此行会被忽略
-10.24.234.17 tag1  # 这是注释，会被忽略
-10.24.234.17 tag2  # 此行和上一行被认为是不同的实例
-10.24.234.18
-10.24.234.19
+10.24.234.17:8080 tag1  # 这是注释，会被忽略
+10.24.234.17:8090 tag2  # 此行和上一行被认为是不同的实例
+10.24.234.18:8080
+10.24.234.19:8080
 ```
 
 优点: 易于修改，方便单测。

docs/en/client.md

@@ -93,10 +93,10 @@ Servers are put in the file specified by `path`. For example, in "file://conf/ma
  * brpc reloads the file when it's updated.
 ```
 # This line is ignored
-10.24.234.17 tag1  # a comment
-10.24.234.17 tag2  # an instance different from the instance on last line
-10.24.234.18
-10.24.234.19
+10.24.234.17:8080 tag1  # a comment
+10.24.234.17:8090 tag2  # an instance different from the instance on last line
+10.24.234.18:8080
+10.24.234.19:8080
 ```
 
 Pros: easy to modify, convenient for unittests.