Minor: Improve ArrowReaderBuilder::with_row_selection
docs
#5824
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Which issue does this PR close?
Closes #.
Rationale for this change
While working on apache/datafusion#10738 it was not entirely clear to me how the row selection interacted with the row group filtering. I think the documentation could be improved to make this more clear.
What changes are included in this PR?
Improve the documentation and add an example
Are there any user-facing changes?
Docs only, no code changes