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docs: clarify that revset parents and children can be empty
I just added "can be empty" since it seems obvious when it becomes empty if it can be empty. AFAICT, the confusion in #3821 is whether or not "no parents" falls back to root().
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@ -50,8 +50,8 @@ Jujutsu attempts to resolve a symbol in the following order:
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The following operators are supported. `x` and `y` below can be any revset, not
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only symbols.
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* `x-`: Parents of `x`.
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* `x+`: Children of `x`.
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* `x-`: Parents of `x`, can be empty.
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* `x+`: Children of `x`, can be empty.
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* `x::`: Descendants of `x`, including the commits in `x` itself.
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* `x..`: Revisions that are not ancestors of `x`.
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* `::x`: Ancestors of `x`, including the commits in `x` itself.
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