Docs: fix empty metric warning filter

[leandrodamascena]

What were you searching in the docs?

We need to fix the banner that explains how to disable warnings.

Is this related to an existing documentation section?

https://docs.powertools.aws.dev/lambda/python/latest/core/metrics/#raising-schemavalidationerror-on-empty-metrics

How can we improve?

Fix the documentation.

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[github-actions]

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