docs:optimize example

[kuwoo]

change the address of polaris config server

PR Type

Describe what this PR does for and how you did.

Adding the issue link (#xxx) if possible.

Note

Checklist

• [ ] Add copyright holder at the beginning of .class file if it is new.
• [ ] Add information of this PR to CHANGELOG.md in root of project.
• [ ] All junit tests passing.
• [ ] Coverage from Codecov Report should not decrease.

Checklist (Optional)

• [ ] Will Pull Request to branch of 2020.0 and 2021.0.
• [ ] Add documentation in javadoc in code or comment below the PR if necessary.
• [ ] Add your name as @author to the beginning of .class file.

[misselvexu]

@kuwoo

Thank you for your first PR.

If not configure spring.cloud.polaris.config.address , By default , sct will use the remote address list configured by spring.cloud.polaris.address and splice the corresponding configured port instead .