[docs] remove mention of the time-to-first-solve issue

[odow]

I don't know that this is helpful anymore. I see people on the forum adding add_bridges = false when they don't really need too. Beginners should never use PackageCompiler. And the ecosystem has made great strides to solving the problem more generally. The examples that took 15 s in the docs now takes <5, which is at the point where I'm willing to declare success:

% time julia --project=. model.jl
julia --project=. model.jl  4.71s user 0.45s system 100% cpu 5.115 total

and a big chunk of what remains is writing the solution summary to a log file. Excluding that so the file is:

using JuMP, HiGHS
model = Model(HiGHS.Optimizer)
set_silent(model)
@variable(model, x >= 0)
@variable(model, 0 <= y <= 3)
@objective(model, Min, 12x + 20y)
@constraint(model, c1, 6x + 8y >= 100)
@constraint(model, c2, 7x + 12y >= 120)
optimize!(model)

we get

% time julia --project=. model.jl
julia --project=. model.jl  2.72s user 0.40s system 101% cpu 3.077 total