Apply 0c5928deada1 for 6.12.y and 6.13.y

[Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>]

Hi Greg, Sasha,

Please consider applying the following commits for 6.12.y and 6.13.y:

    0c5928deada1 ("rust: block: fix formatting in GenDisk doc")

It is trivial, and should apply cleanly.

This avoids a Clippy warning in the upcoming Rust 1.86.0 release (to
be released in a few weeks).

Thanks!

Cheers,
Miguel