Minor: Add more docs and examples for Transformed
and TransformedResult
#11003
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Which issue does this PR close?
Part of #7013
Rationale for this change
Transformed
is a key structure when using the TreeNode API and so it is important to make it as easy to use as possible.What changes are included in this PR?
Are these changes tested?
Covered by doc tests
Are there any user-facing changes?
New docs
There are no functional changes