[Doc] Update jnp.argmin/argmax doc for Pallas TPU

[catswe]

Doc update while #34620 is being resolved

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[gemini-code-assist]

Summary of Changes

Hello @catswe, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request provides an important documentation update for the jnp.argmax and jnp.argmin functions within JAX. The primary goal is to inform users about a current discrepancy in behavior on Pallas TPU hardware, where the functions do not consistently return the smallest index when multiple maximum or minimum values are present. This clarification is a temporary measure while an underlying issue is being addressed, ensuring users are aware of the current operational specifics.

Highlights

• Documentation Update: Updated the documentation for jnp.argmax and jnp.argmin to clarify their behavior on Pallas TPU when multiple occurrences of the maximum or minimum value exist.
• Pallas TPU Specifics: Added a note indicating that the standard behavior of returning the smallest index for multiple identical values is currently not true on Pallas TPU for these functions.

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Code Review

This PR updates the docstrings for jnp.argmax and jnp.argmin to note a behavioral difference on Pallas TPU. The changes are good, but I've suggested making these notes more prominent by using a .. warning:: directive and including a link to the tracking issue for more context. This will help prevent users from being surprised by platform-specific behavior.