minor: Add more doc to clarify permutation satisfying input order in InputOrderMode
#9255
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Which issue does this PR close?
Closes #.
Rationale for this change
When investigating an issue about Comet, I'm reading through
InputOrderMode
. It takes some time to trace other related code to understand what it means. This patch adds a few more doc toInputOrderMode
to make it more clear.What changes are included in this PR?
Are these changes tested?
Are there any user-facing changes?