rafthttp: Update typo in warn message in checkClusterCompatibilityFromHeader

[aladesawe]

Update typo in the warn message

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[k8s-ci-robot]

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This pull-request has been approved by: aladesawe
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[k8s-ci-robot]

Hi @aladesawe. Thanks for your PR.

I'm waiting for a etcd-io 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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[aladesawe]

@ivanvc I stumbled on this misleading message. Please let me know if an issue should be created to update this.