[hi] Localize contribute/participate/_index.md

[rajyavardhan01]

What this PR does / why we need it

This PR localizes the "Participating in SIG Docs" page to Hindi.

File added:content/hi/docs/contribute/participate/_index.md

Content translated:

• SIG Docs overview and introduction
• Roles (member, reviewer, approver)
• SIG Docs chairperson responsibilities
• SIG Docs teams and automation (GitHub teams, OWNERS files)
• How merging works

Which issue(s) this PR fixes

Fixes#36471

Special notes for your reviewer

Translation choices:

English	Hindi	Reason
SIG Docs	SIG Docs	Proper noun, kept as-is
documentation	दस्तावेज़ीकरण	Standard Hindi term
member	सदस्य	Standard translation
reviewer	समीक्षक	Standard translation
approver	अनुमोदक	Standard translation
chairperson	अध्यक्ष	Standard translation
merging	मिलाना	Hindi verb for merge
automation	स्वचालन	Standard translation

Technical terms like PR, GitHub, OWNERS, prow, etc. are kept in English.

/language hi

[k8s-ci-robot]

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[rajyavardhan01]

Hi I have now made necessary commits. Pls let me know if there is anything pending to merge this PR. Thanks!