Minor: Improve comments in row_hash.rs for skipping aggregation #11820
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Which issue does this PR close?
Follow on to #11627
Rationale for this change
@2010YOUY01 had some good suggestions on #11627 such as https://github.com/apache/datafusion/pull/11627/files#r1695417159 which I wanted to capture as part of filing the follow up work
What changes are included in this PR?
Update some comments
Are these changes tested?
Are there any user-facing changes?
Comment changes only, no functional changes