[DOC]: Optimizing Docker Documentation

[cipchk]

Suggested Changes

Mainly targeting https://docs.openim.io/zh-Hans/guides/gettingStarted/dockerCompose

1. Recommendation to add upgrade instructions: It's easy to overlook the volumes data volume, which can often cause upgrade failures. If you encounter issues such as token invalidation, it is likely due to old data volumes.
2. Recommendation to specify the use of environment variables: Clearly state the usage of environment variables and how to find all available environment variables.
3. Regarding the Minio section: It is recommended to mention that Minio should be maintained through the Minio client. By default, a port (http://ip:10004/) will be enabled for accessing the Minio client.