docs: Broken links in GOVERNANCE.md (CONTRIBUTING and MAINTAINERS)

[PiyushShiv26]

The GOVERNANCE.md file in this repository contains two broken links in the "Governance Committee" section.

• CONTRIBUTING.md: Currently links to a 404 and does not appear to exist in the root or the .github repo.
• MAINTAINERS.md: Currently links to a 404 and does not appear to exist in the root or the .github repo.

Screenshots: