Update README.md

[lspanodd]

We made two changes to the documentation page:
1 - in the Annotations v1 example, we were not using the container name for check, which is incorrect and it will not work. Replaced the postgresql.check_names for postgres.check_names to match the container name.
2. We added a note to guide customers to match their container name in the integration check_names. We are open to suggestion regarding the added note in the documentation.

What does this PR do?

We made two changes to the documentation page:
1 - in the Annotations v1 example, we were not using the container name for check, which is incorrect and it will not work. Replaced the postgresql.check_names for postgres.check_names to match the container name.
2. We added a note to guide customers to match their container name in the integration check_names. We are open to suggestion regarding the added note in the documentation.
Based on customer confusion in case https://datadog.zendesk.com/agent/tickets/2237581

Motivation

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• 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

[github-actions]

⚠️ Recommendation: Add qa/skip-qa Label

This PR does not modify any files shipped with the agent.

To help streamline the release process, please consider adding the qa/skip-qa label if these changes do not require QA testing.

[traegerdog]

/merge

[dd-devflow-routing-codex]

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2025-10-10 15:30:06 UTC ℹ️ Start processing command /merge

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2025-10-10 19:31:15 UTC ⚠️ MergeQueue: This merge request was unqueued

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