Fix broken OWNER links in sig-etcd README

[henrybear327]

Fixed active projects' OWNER link only, mainly by changing file name from MAINTAINERS to OWNERS and updating branch name from master to main

Notice that for a repo that doesn't have a MAINTAINER or OWNER file, the link is left as-is, the dbtester repo.

References:

• Complete migration to OWNERS file etcd-io/bbolt#578

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: henrybear327 / name: Chun-Hung Tseng (5edd163)

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[k8s-ci-robot]

Hi @henrybear327. Thanks for your PR.

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[jmhbnz]

Thanks for fixing this @henrybear327

/lgtm
/approve

[ahrtr]

/lgtm
/approve

Thank you!

[ahrtr]

/hold

The workflow fails

[henrybear327]

Sorry, I just realized this README.md file needs to be edited from the sigs.yaml file. On it. Sorry again.

[henrybear327]

Fixed according to the CI error message's suggestion. @ahrtr @jmhbnz

[ahrtr]

/lgtm
/approve

[ahrtr]

/ok-to-test

[ahrtr]

/hold cancel

[ahrtr]

/assign @mrbobbytables

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, cblecker, henrybear327, jmhbnz

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Needs approval from an approver in each of these files:

• OWNERS [cblecker]

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