Fix the link in rustdoc.md

[makai410]

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[ehuss]

Thanks! However, I don't think the new link is correct. This file is rendered at https://doc.rust-lang.org/nightly/rustdoc.html, and it is trying to link to the Rust Book. However, it is currently going to the older link at https://doc.rust-lang.org/nightly/book/documentation.html.

I think this would either link to book/ch14-02-publishing-to-crates-io.html#making-useful-documentation-comments or rustdoc/index.html.

@GuillaumeGomez do you have a preference?

[GuillaumeGomez]

If we're talking about working on rustdoc, I'd link to https://rustc-dev-guide.rust-lang.org/rustdoc-internals.html. If it's about using rustdoc, I'd link to https://doc.rust-lang.org/rustdoc/what-is-rustdoc.html.

[ehuss]

Yea, this is for users. You can see what the old docs looked like at https://doc.rust-lang.org/0.11.0/rustdoc.html.