Fix link regular expression and test

[brianstrauch]

Release Notes

Breaking Changes

• PLACEHOLDER

New Features

• PLACEHOLDER

Bug Fixes

• Fix broken link highlighting in confluent local kafka start

Checklist

• I have successfully built and used a custom CLI binary, with no linting issues identified from this PR.
• I have clearly specified in the Release Notes section above whether this PR applies to Confluent Cloud, Confluent Platform, or both.
• I have verified this PR with Confluent Cloud resources in a production environment, if applicable.
• I have verified this PR with Confluent Platform resources in an on-premises environment, if applicable.
• I have attached manual CLI verification results or screenshots in the Test & Review section below.
• I have added appropriate CLI integration tests for any new or updated commands and functionality.
• I confirm that this PR introduces no breaking changes or backward compatibility issues.
• Leave this box unchecked if features introduced in this PR are not yet available in production.

What

Before:

After:

References

Test & Review

Unit tests

[confluent-cla-assistant]

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[sgagniere]

lgtm, thanks!