Fix nesting or disable expansion arrow using Documenter.jl

To avoid docs duplication, we’re using @docs; canonical=false to reference a docstring in the How-To section of our documentation.

What bothers us is the collapse arrow, which makes this section look different from the others. (See image)

Is there a way to remove the nesting/collapse arrow? Or is there another way to do this reference?

The EnergyProblem section collapses and is in a nested box, while the Graph section is not: