Improve docs and xrefs re tree building#726

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ijackson:treebuild-docs

Apr 1, 2023

Commits on Apr 1, 2023

TreeUpdateBuilder: Remove confusing note re libgit2 function

ijackson
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ehuss
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TreeUpdateBuilder/TreeBuilder: Document and cross-reference

ijackson
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ehuss
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Minor doc wording update.
ehuss
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