community: Add WG Chair and Tech Lead sections. Fixes #3890

[puwun]

Description of Changes

Added detailed sections for WG Chair and WG Tech Lead roles to the community membership documentation content/en/docs/about/membership.md

Related Issues

Closes: #3890

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[google-oss-prow]

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[google-oss-prow]

Hi @puwun. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Arhell]

/ok-to-test

[juliusvonkohout]

WHat is the purpose of the PRß is this aligned with the KSC ? CC @varodrig