Add sig-docs-es team

[raelga]

This pull requests adds the sig-docs-es team to the community repo. This team is working on the spanish localization and was added in kubernetes/org#685.

❯ make WHAT=sig-docs generate | grep -v Skipping
go run ./generator/app.go
Generating sig-docs/README.md
Generating sig-list.md
Generating OWNERS_ALIASES
Finished generation!

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[raelga]

/cc @zacharysarah

[zacharysarah]

/lgtm
/approve

[cblecker]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cblecker, raelga, zacharysarah

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