Make debugging page shorter

[hersle]

Fix or mitigate #3882.

julia> dsys = debug_system(sys; functions = []);
       dprob = ODEProblem(dsys, [], (0.0, 10.0));
       dsol = solve(dprob, Tsit5(); dtmin = 0.1); # high dtmin only to show less clutter on this page
┌ Error: Assertion (u1(t) + u2(t)) >= 2.0 failed:
│ Oh no!
└ @ ModelingToolkit ~/.julia/dev/ModelingToolkit.jl/src/debugging.jl:67
┌ Error: Assertion (u1(t) + u2(t)) >= 2.0 failed:
│ Oh no!
└ @ ModelingToolkit ~/.julia/dev/ModelingToolkit.jl/src/debugging.jl:67
┌ Error: Assertion (u1(t) + u2(t)) >= 2.0 failed:
│ Oh no!
└ @ ModelingToolkit ~/.julia/dev/ModelingToolkit.jl/src/debugging.jl:67
┌ Error: Assertion (u1(t) + u2(t)) >= 2.0 failed:
│ Oh no!
└ @ ModelingToolkit ~/.julia/dev/ModelingToolkit.jl/src/debugging.jl:67
┌ Error: Assertion (u1(t) + u2(t)) >= 2.0 failed:
│ Oh no!
└ @ ModelingToolkit ~/.julia/dev/ModelingToolkit.jl/src/debugging.jl:67
┌ Error: Assertion (u1(t) + u2(t)) >= 2.0 failed:
│ Oh no!
└ @ ModelingToolkit ~/.julia/dev/ModelingToolkit.jl/src/debugging.jl:67
┌ Warning: dt(0.1) <= dtmin(0.1) at t=0.4538820261379217, and step error estimate = NaN. Aborting. There is either an error in your model specification or the true solution is unstable.
└ @ SciMLBase ~/.julia/packages/SciMLBase/YE7xF/src/integrator_interface.jl:646