Fixed broken link in The rustdoc book, Ayu theme

[davidzr]

Fixes #116977

[rustbot]

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

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[fmease]

Thanks for your PR! Unfortunately, #117026 was opened 5 minutes earlier and has already been approved.
I hope this doesn't discourage you from contributing in the future though!
Always happy to see more people working on Rust!

While it's not strictly necessary to do so, you can claim an issue by writing @rustbot claim to signal to others that you plan on working on it.

Closing in favor of #117026.