std::f32 impl Float is duplicated

[mdinger]

std::f32 doc page has impl Float for f32 at the top and at the bottom.

• The bottom one seems to have more elements though it's not clear why.
• Their styling is the same so it's not obvious if they should mean 2 different things.

Something should change so either they don't look like misshapen clones or it's clear what they mean.

[nagisa]

Possibly a dupe of #21474

[mdinger]

Perhaps but this doesn't use globs as far as I can tell which is the requirement for that other bug.