Minor: Improve PruningPredicate
docstrings
#8748
Merged
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Which issue does this PR close?
Related to #7869
Rationale for this change
As we have extended the PruningPredicate's features and scope, we should also improve its documentation to match.
What changes are included in this PR?
Improve the PruningPredicate doc strings to reflect its ongoing changes
Are these changes tested?
via doctests
Are there any user-facing changes?
Doc strings only. No code changes