**Description:**
The standard markdown [!NOTE] format is not supported on Sphinx
generated documentation, replacing those instances. Also updating other
Notes, Tips and Warning blocks throughout the source docs
WIP: Working to update the provider code gen
# What does this PR do?
<!-- Provide a short summary of what this PR does and why. Link to
relevant issues if applicable. -->
This pull request adds documentation to clarify the differences between
the Agents API and the OpenAI Responses API, including use cases for
each. It also updates the index page to reference the new documentation.
<!-- If resolving an issue, uncomment and update the line below -->
<!-- Closes #[issue-number] -->
Closes#2368
