Document MOI-specific parameters

[odow]

For example:

Xpress.jl/src/MOI/MOI_wrapper.jl

Lines 547 to 549 in fdf66a2

	elseif param == MOI.RawOptimizerAttribute("MOI_SOLVE_MODE")
	# https://www.fico.com/fico-xpress-optimization/docs/latest/solver/optimizer/R/HTML/lpoptimize.html
	model.solve_method = value

x-ref: https://discourse.julialang.org/t/how-to-specify-barrier-method-to-use/81290