Clarify the use case of Polaris Spark client #2948
Description
Is your feature request related to a problem? Please describe.
We may clarify in the documentation that:
1. Do you need a Polaris Spark client to connect to Polaris?
No. For Iceberg tables, the standard Iceberg Spark client is sufficient.
Only Generic tables require the Polaris Spark client.
2. Classpath Isolation
Do not mix the Polaris Spark client and the Iceberg Spark client in the same classpath.
Each should run in its own isolated environment to avoid dependency conflicts.
3. Limitations of Polaris Spark Client
Related thread: https://apache-polaris.slack.com/archives/C084QSKD6S2/p1760817185391409
Describe the solution you'd like
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Describe alternatives you've considered
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Additional context
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