Use relative links in the unstable and rustc book

[Ezrashaw]

Fixes #98227.

As it stands, potential issues could arise from mismatch of stable/ nightly in the books. This PR fixes this issue by using relative links instead of absolute ones. I have replaced every absolute link under src/doc/rustc and src/doc/unstable-book/ and tested each manually.

The link at src/doc/rustc/src/targets/index.md:7:
[here](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_target/spec/struct.Target.html).
I need help with because my local directory structure and https://doc.rust-lang.org/ seem to be different, where is nightly-rustc?

@jyn514

[rustbot]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @JohnTitor (or someone else) soon.

Please see the contribution instructions for more information.

[jyn514]

The link at src/doc/rustc/src/targets/index.md:7:
here.
I need help with because my local directory structure and https://doc.rust-lang.org/ seem to be different, where is nightly-rustc?

nightly-rustc is the base url for the compiler docs. If you run x doc --stage 0 compiler, you should see the docs in build/$TARGET/compiler-doc/.

You can use x test --stage 0 linkchecker to verify the links work :) you don't need to do it manually.

[jyn514]

This looks great, thanks! Happy to approve the PR once CI passes and you address the comments I left :)

[jyn514]

r? @jyn514

[Ezrashaw]

You can use x test --stage 0 linkchecker to verify the links work :) you don't need to do it manually.

Oh well, that was only 30 minutes and linkchecker says there are a couple broken ones :(.

Ok, I'll do all your suggestions and fix the broken links, do you want me to squash and force-push? (I'm new to this)

[jyn514]

Yes, force-pushing would be great :) there are instructions on https://rustc-dev-guide.rust-lang.org/git.html#advanced-rebasing

[jyn514]

Looks great, thank you!

@bors r+

[bors]

📌 Commit 9ea3550 has been approved by jyn514

It is now in the queue for this repository.

[bors]

⌛ Testing commit 9ea3550 with merge 01ef4b2...

[bors]

☀️ Test successful - checks-actions
Approved by: jyn514
Pushing 01ef4b2 to master...

[rust-timer]

Finished benchmarking commit (01ef4b2): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

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