Minor: Document memory management design on MemoryPool
#8966
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Which issue does this PR close?
Related to #587
Rationale for this change
@SteveLauC asked about this on #587 (comment)
and I realized the rationale and high level design of the memory management system wasn't documented anywhere
What changes are included in this PR?
Add doc comments to
MemoryPool
to add more background and rationaleAre these changes tested?
Covered by existing doc comments
Are there any user-facing changes?
Better docs