Document how to use Extend for generic methods on ArrayBuilders #6932
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Which issue does this PR close?
Improve docs per this conversation, for how to use the Extend implementations of ArrayBuilders in order to build generic functions over these builders.
Rationale for this change
As noticed in this code review, where declarative macros were used instead of generics. All involved were not aware of this alternative approach of using the Extend for generic functions over the builders. Therefore, provide more docs.
What changes are included in this PR?
Docs only.
Are there any user-facing changes?
Docs only.