chore(docs): add SparkClient to SDK API reference

[khanavi272-spec]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged):

Fixes #

Checklist:

• Docs included if any changes are user facing

[google-oss-prow]

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[Copilot]

Pull request overview

Adds SparkClient to the SDK’s Sphinx API reference so it appears alongside existing Trainer API documentation.

Changes:

• Extend docs/source/train/api.rst to include an autodoc section for kubeflow.spark.SparkClient.

[Copilot]

Adding .. autoclass:: kubeflow.spark.SparkClient will cause the docs CI job (uv sync --group docs) to import kubeflow.spark.api.spark_client, which imports pyspark at module import time; since pyspark isn’t installed in the docs dependency group, Sphinx will fail to build the docs. Fix by either mocking pyspark for autodoc (e.g., via autodoc_mock_imports in docs/source/conf.py) or ensuring the docs build installs the spark extra / pyspark dependency.

Suggested change

	.. autoclass:: kubeflow.spark.SparkClient
	:members:
	:show-inheritance:
	.. note::
	The ``SparkClient`` API reference is not built in this documentation
	configuration because it depends on the optional ``pyspark``/``spark``
	extra, which is not installed for the docs build.

[astefanutti]

Thanks @khanavi272-spec!

/retitle chore(docs): add SparkClient to SDK API reference

/ok-to-test

fixes #354

[astefanutti]

@khanavi272-spec can you sign the commit please.

/assign @andreyvelich @kramaranya @Shekharrajak @tariq-hasan

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In response to this:

@khanavi272-spec can you sign the commit please.

/assign @andreyvelich @kramaranya @Shekharrajak @tariq-hasan

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