[FLINK-23489][docs] Change flink-config.yaml to flink-conf.yaml

[hapihu]

The relevant pages are as follows：

https://ci.apache.org/projects/flink/flink-docs-master/docs/deployment/cli/

https://ci.apache.org/projects/flink/flink-docs-master/zh/docs/deployment/cli/

The related documents are as follows：

docs/content/docs/deployment/cli.md

docs/content.zh/docs/deployment/cli.md

In these pages, conf/flink-config.yaml should be changed to conf/flink-conf.yaml

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[wuchong]

Could you also update the English doc docs/content/docs/deployment/cli.md as well?

[hapihu]

Could you also update the English doc docs/content/docs/deployment/cli.md as well?

@wuchong , Hi，I also update the English doc docs/content/docs/deployment/cli.md in this pr.
Would you like to review it for me again? [抱拳][呲牙]

[wuchong]

LGTM.