docs: fix "Cillium" → "Cilium" typo in sig-etcd vision

[Shion1305]

/kind documentation

What this PR does:
Fixes a small spelling typo in sig-etcd/vision.md: the project name Cillium should be Cilium.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
Single-character documentation fix; no other content was modified.

NONE

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Hi @Shion1305. Thanks for your PR.

I'm waiting for a kubernetes 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.

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[stmcginnis]

Good catch

/lgtm

[cblecker]

/ok-to-test
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cblecker, Shion1305

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