Add missing quote

[chinskiy]

What does this PR do?

This example is equal to the one that is used at https://developer.hashicorp.com/vault/tutorials/monitoring/troubleshooting-vault#not-finding-the-server-logs But lack ending quote.

Motivation

Incorrect example on the integrations page

Additional Notes

None

Review checklist (to be filled by reviewers)

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• [ ] Changelog entries must be created for modifications to shipped code
• [ ] Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• [ ] If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged