Document and code comment are inconsistent for `is_final_response()` usage

[tosi29]

Describe the bug

According to document,

Use is_final_response(): Rely on this helper method in your application/UI layer to identify complete, user-facing text responses. Avoid manually replicating its logic.

The document recommends to use is_final_response() method.

However, according to comment,

NOTE: This method is ONLY for use by Agent Development Kit.

This implies the method is internal and should not be used by application developers.

It looks inconsistent.
It is unclear whether this method is intended to be a public API for developers or strictly for internal use within the ADK.

To Reproduce
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Expected behavior
Please clarify the intended usage of is_final_response().
If it is for public use (as per docs), the code comment "ONLY for use by Agent Development Kit" should be removed or rephrased.

Screenshots
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Desktop (please complete the following information):
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Model Information:
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Additional context
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