Feedback: better ternary example in documentation

[ArnoStrouwen]

It took me some time to figure out why this didn't work

julia> using DynamicExpressions
       lt(x::Float64, a::Float64, b::Float64) = a * x + b
       unary_ops = (-, inv, exp)
       binary_ops = (+, *)
       ternary_ops = (lt,)
       operators = OperatorEnum(1 => unary_ops, 2 => binary_ops, 3 => ternary_ops)
       Node{Float64}(op=0x1, children=(Node{Float64}(val=1.0), Node{Float64}(val=2.0),Node{Float64}(val=3.0)))
ERROR: AssertionError: D2 <= max_degree(N)
Stacktrace:
 [1] node_factory
   @ ~/.julia/packages/DynamicExpressions/85cyI/src/Node.jl:409 [inlined]
 [2] #_#69
   @ ~/.julia/packages/DynamicExpressions/85cyI/src/Node.jl:362 [inlined]
 [3] AbstractExpressionNode
   @ ~/.julia/packages/DynamicExpressions/85cyI/src/Node.jl:347 [inlined]
 [4] top-level scope
   @ ~/SR playground/Q2.jl:7

I don't think there are any examples where the D type parameter is set manually:

julia> Node{Float64,3}(op=0x1, children=(Node{Float64,3}(val=1.0), Node{Float64,3}(val=2.0),Node{Float64,3}(val=3.0)))
lt(1.0, 2.0, 3.0)

[MilesCranmer]

Thanks, very helpful