Update the doc of FeatInsight example config file

**Bug Description**

Update the doc in https://openmldb.ai/docs/zh/main/app_ecosystem/feat_insight/install/package.html .

```
server:
port: 8888

openmldb:
zk_cluster: 127.0.0.1:2181
zk_path: /openmldb
apiserver: 127.0.0.1:9080
```

Change to the following config.

```
server:
port: 8888

openmldb:
zk_cluster: openmldb-zk:2181
zk_path: /openmldb
apiserver: openmldb-zk:9080
skip_index_check: false

mockuser:
username: root
password: root
```