Minor: Clarify docs on UnionBuilder::append_null
#1628
Merged
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Follow on to #1589
Rationale for this change
Encode the non obvious (to me) rationale for having to specify child / field name in
UnionBuilder::append_null
. See comment from @tustvold #1589 (comment)What changes are included in this PR?
Update doc strings
Are there any user-facing changes?
Docs