Relative links to arch modules

[pravic]

Currently stdsimd modules point to the documentation hosted at https://rust-lang-nursery.github.io/stdsimd/aarch64/stdsimd/ instead of https://doc.rust-lang.org/std/arch/ which is confusing.

Since Rust 1.27 has shipped the stdsimd, and its documentation is hosted on the official site, it is essential to make those links relative.

The only exception are links to powerpc and powerpc64, because they are unavailable (yet?).

[gnzlbg]

The only exception are links to powerpc and powerpc64, because they are unavailable (yet?).

That should have been fixed in #486

[gnzlbg]

I've restarted the travis-ci build, let me know if the powerpc links are still broken.

[gnzlbg]

The coresimd links need to be updated as well: https://github.com/rust-lang-nursery/stdsimd/blob/master/coresimd/mod.rs#L40

Basically, after this PR there shouldn't be any links to https://rust-lang-nursery.github.io/ (that is, grepping the library for that should return no matches).

[gnzlbg]

@pravic any progress on this or is there a blocker? (do you need help / are you stuck with something that we can help with? :) )

[pravic]

What progress? I've changed a couple of links, that's all from me. Feel free to cherry pick this and put wherever you want.

[gnzlbg]

Thanks for working on this! I've made some changes and submitted this in #506 which should land soon.

[pravic]

Ok, great. Even though the current nightly does not contain it still, I hope it will soon.

[gnzlbg]

@pravic the current nightly was generated on 2018-06-28 :/ Hopefully a new nightly will come up soon.

[pravic]

It's no problem, just good to know.