Incomplete docstring

[serenity4]

I noticed the following docstring was incomplete:

OPTIONAL: Type inference is used to attempt to

[markmbaum]

Also noticed this

[nsajko]

The doc string with the unfinished sentence:

AbstractTrees.jl/src/traits.jl

Lines 165 to 175 in 6f9cd4a

	"""
	childstatetype(::Type{T})
	childstatetype(n)
	Indicates the type of the iteration state of the tree node `n` or its type `T`. This is used by tree traversal
	algorithms which must retain this state. It therefore is necessary to define this to ensure that most tree
	traversal is type stable.
	**OPTIONAL**: Type inference is used to attempt to
	"""
	childstatetype(::Type{T}) where {T} = Iterators.approx_iter_type(childrentype(T))