[Doc] Examples are not displayed correctly in the REPL

[amontoison]

help?> beam
search: beam break basename rem Real read real reim

  DocStringExtensions.TypedMethodSignatures()

  Defines the optimal control problem beam for a given back-end.

  Arguments
  ≡≡≡≡≡≡≡≡≡

    •  model_backend::T: The modelling back-end, subtype of AbstractModelBackend.

    •  N::Int=0: Number of discretisation steps (optional).

  Returns
  ≡≡≡≡≡≡≡

    •  Throws an ExtensionError if the required back-end is not available.

  Example
  ≡≡≡≡≡≡≡

  julia> beam(JuMPBackend(); N=20)
  ERROR: ExtensionError(:JuMP)