Minor: Add comments about initial value for BitAnd
accumulator
#6964
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Which issue does this PR close?
Follow on to #6957
Rationale for this change
I didn't see a comment from @viirya #6957 (comment) that had the good suggestion to explain the default value
What changes are included in this PR?
Add doc comments to explain the code
Are these changes tested?
N/A
Are there any user-facing changes?