Improving governance doc with vendor neutrality and vote sceanrios

[RainbowMango]

What type of PR is this?

/kind documentation

What this PR does / why we need it:
Improving governance doc with more explicit vendor neutrality and matters requires a 2/3 majority vote.

Which issue(s) this PR fixes:
Fixes #136
Part of #119

Special notes for your reviewer:

[Copilot]

Pull Request Overview

This PR improves the governance documentation by clarifying vendor neutrality and outlining specific actions that require a two-thirds majority vote.

• Updates the maintainers section with a vendor neutrality clause limiting any single vendor to less than 50% of the seats.
• Introduces a numbered list specifying actions that require a two-thirds majority vote.

Comments suppressed due to low confidence (1)

GOVERNANCE.md:45

• Consider inserting a space after the closing backtick before 'This' to improve readability.

than 50% of maintainer seats`.This may change as the community grows, such as by 

[lfbear]

/lgtm

[kevin-wangzefeng]

/lgtm

Thanks for codifying this.

/hold
Holding this to ensure we reach a 2/3 majority vote by current maintainers before being merged.
/cc @mrlihanbo @carmark @GitHubxsy @wawa0210 @zoroyouxi @lfbear

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kevin-wangzefeng

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dismissing github approval to avoid unepxected merge