Mseal/experimental references fix

[MSeal]

Fixed remaining references to experimental modules in docs, plus a changelog typo

Checklist

• Contains customer facing changes? Including API/behavior changes
• Did you add sufficient unit test and/or integration test coverage for this PR?
  • If not, please explain why it is not required

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[Copilot]

Pull request overview

This PR updates documentation to remove references to the "experimental" module path for AsyncIO components, reflecting their promotion to stable status. The changes also correct a typo in the CHANGELOG.

• Updated import paths from confluent_kafka.experimental.aio to confluent_kafka.aio
• Removed "experimental" designations from documentation headers and descriptions
• Fixed typo: "interaces" → "interfaces"

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
examples/README.md	Updated import statements to remove experimental path references in code examples
aio_producer_simple_diagram.md	Updated source code locations and removed experimental references from documentation links
README.md	Updated AsyncIO Producer section title, description, and import examples to remove experimental designation
DEVELOPER.md	Updated project layout documentation and source code references to reflect new stable path
CHANGELOG.md	Fixed typo and removed experimental designation from AsyncIO Producer section header

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[ojasvajain]

Can still see a couple of occurrences of "experimental" in examples/README.md

Should we fix these as well?

[sonarqube-confluent]

Quality Gate passed

Issues
0 New issues
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