Oudated html_root_url for compiler crates

[bjorn3]

https://doc.rust-lang.org/nightly/ should be https://doc.rust-lang.org/nightly/nightly-rustc/

[jyn514]

Mentoring instructions: for each crate in compiler/, change

rust/compiler/rustc_apfloat/src/lib.rs

Line 33 in 9e5f7d5

#![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]

to say #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc")] instead. You can probably automate this with fd and sed. You can test your changes by running x.py check to make sure the syntax is valid or x.py doc to make sure the generated HTML is correct. Make sure to set compiler-docs = true in config.toml.

[duckymirror]

@rustbot claim