Update code of conduct link

[hzxuzhonghu]

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[gemini-code-assist]

Code Review

This pull request updates the Volcano Code of Conduct link in GOVERNANCE.md to use the correct uppercase filename and adds a missing newline at the end of the file. The reviewer identified minor typos in the Credits section, suggesting corrections for "this documents" to "this document" and "CoreDns" to "CoreDNS".