fix(website): fix healthcheck -> healthchecks

[thomasqueirozb]

Summary

healthcheck is incorrect. It should be healthchecks instead

Vector configuration

NA

How did you test this PR?

NA

Change Type

• Bug fix
• New feature
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

• Related: Is the `healthchecks` global option deprecated? #24251 (reply in thread)

Notes

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