[MINOR][SS][DOC] Fix the ss-kafka doc for availability of 'minPartitions' option
[MINOR][SS][DOC] Fix the ss-kafka doc for availability of 'minPartitions' option

### What changes were proposed in this pull request?

This patch fixes the availability of `minPartitions` option for Kafka source, as it is only supported by micro-batch for now. There's a WIP PR for batch (#25436) as well but there's no progress on the PR so far, so safer to fix the doc first, and let it be added later when we address it with batch case as well.

### Why are the changes needed?

The doc is wrong and misleading.

### Does this PR introduce any user-facing change?

No.

### How was this patch tested?

Just a doc change.

Closes #26849 from HeartSaVioR/MINOR-FIX-minPartition-availability-doc.

Authored-by: Jungtaek Lim (HeartSaVioR) <6dfb5872701d21af1c4dd7add991df02fba61fbf@gmail.com>
Signed-off-by: Dongjoon Hyun <9b02cb7e37158797a8e22c559f7c5f5ecd28ea57@apple.com>

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