Link to exact location of usage

Author: DilumAluthge

README.md

@@ -38,9 +38,9 @@ Packaging:
 
 Other:
 
-- [JuliaCI/PkgEval.jl](https://github.com/JuliaCI/PkgEval.jl) ([usage](TODO)): A package to test one or more Julia versions against the Julia package ecosystem.
-- [JuliaLang/www.julialang.org](https://github.com/JuliaLang/www.julialang.org) ([usage](TODO)): The Julia website repo (uses `versions.json` to auto-generate the list of Julia releases).
-- [StefanKarpinski/Resolver.jl](https://github.com/StefanKarpinski/Resolver.jl) ([usage](TODO)).
+- [JuliaCI/PkgEval.jl](https://github.com/JuliaCI/PkgEval.jl) ([usage](https://github.com/JuliaCI/PkgEval.jl/blob/b3eb65eebfc604cbb576e56eb8aea621e81afecc/src/julia.jl#L6)): A package to test one or more Julia versions against the Julia package ecosystem.
+- [JuliaLang/www.julialang.org](https://github.com/JuliaLang/www.julialang.org) ([usage](https://github.com/JuliaLang/www.julialang.org/blob/cbfac612a7bd0c8d90dad2a0f882bc152074dc7e/downloads/oldreleases.jl#L16)): The Julia website repo (uses `versions.json` to auto-generate the list of Julia releases).
+- [StefanKarpinski/Resolver.jl](https://github.com/StefanKarpinski/Resolver.jl) ([usage](https://github.com/StefanKarpinski/Resolver.jl/blob/9353ca543fb83012cc8fb9fb427febbc01b34ccf/bin/Registries.jl#L16)).
 
 [^2]: This means that every tool that uses Juliaup is indirectly downstream of `versions.json`.