Minor: Add more docs and examples for Expr::unalias
#10406
Merged
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Which issue does this PR close?
Part of #7013
Rationale for this change
I have had to look up the behavior of this function several times when working on optimizer rules, so I would like to better document it
What changes are included in this PR?
Are these changes tested?
Doc CI check
Are there any user-facing changes?
Better docs