[MINOR][SS] Minor update to watermark propagation comments #49188
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What changes were proposed in this pull request?
A few minor changes to clarify (and fix one typo) in the comments for watermark propagation in Structured Streaming.
Why are the changes needed?
I found some of the terminology around "simulation" confusing, and the current comment describes incorrect logic for output watermark calculation.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
N/A.
Was this patch authored or co-authored using generative AI tooling?
No