Fix generic const order display in rustdoc

[GuillaumeGomez]

Fixes #61292.

r? @varkor

[varkor]

This corrects the order in rustdoc, but what is the underlying order in rustc? Is the reason the parameters aren't in the correct order a problem before it gets to rustdoc at all? If so, we should fix it at an earlier point.

[GuillaumeGomez]

I'm not completely sure about it. Also, is the generic parameters order important for rust internals? I'll check if it comes from rustdoc but I think it comes from the internals. If so, I'll just update the internals directly.

[varkor]

At the moment, the internal order is important, though eventually we'd like to change this: #61334. I think rustdoc should be faithful to the internals, so that's where we should fix the issue if that's where it's originating.

[GuillaumeGomez]

Update: Still need to look into the internals.

[joelpalmer]

Hi @GuillaumeGomez, this is a ping from Triage. Please provide an update on this PR at your earliest convenience.

[GuillaumeGomez]

Still need to start digging in the compiler. Not much time currently though.

[varkor]

Maybe it'd be worth closing this pull request, as a proper fix is going to look quite different anyway.

[GuillaumeGomez]

Indeed. Let's close it then!