Docs: Update release process documentation

[leandrodamascena]

What were you searching in the docs?

I want to update the release process documentation to make it clear that anyone can release a new version of Powertools for AWS Lambda Python.

Is this related to an existing documentation section?

https://docs.powertools.aws.dev/lambda/python/latest/maintainers/#releasing-a-new-version

How can we improve?

Update this section to add a clear explanation on how to make a new release.

Got a suggestion in mind?

No response

Acknowledgment

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

[powertools-for-aws-oss-automation]

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