WARNING: deprecated syntax "_ as an rvalue around docs/Docs.jl:522"

[juliohm]

This warning is hanging around for months. Where is it coming from?

One online example in the Luxor docs: https://juliagraphics.github.io/Luxor.jl/stable/moreexamples.html#Strange-1

[kristoffer.carlsson]

https://github.com/JuliaDocs/Documenter.jl/issues/538