Fix issue ref typo in comments of `doc/make.jl` (#30490)
In the doc/make.jl, there is a code block for making links for
stdlib. It mentioned JuliaDocs/Documenter.jl#522 in the comment
but JuliaDocs/Documenter.jl#522 seems not relevant to this and
it should be JuliaDocs/Documenter.jl#552.
Fix #30489.
