Minor: Improve documentation about pushdown join predicates #11209
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Which issue does this PR close?
Related to #10881
Rationale for this change
While reviewing #11203 from @viirya I found some of the discussion about preserved input and what they meant somewhat confusing
What changes are included in this PR?
Refine documentation to reflect better what was going on.
Are these changes tested?
N/A
Are there any user-facing changes?
No, this is internal documentation and no functional changes