Document powf and powi values that are always 1.0

[hkBst]

fixes bug #90429

[rustbot]

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[compiler-errors]

Like @matthiaskrgr noted in the other PR, please merge these into one. I'm gonna leave this one open and close the rest.

[compiler-errors]

Also regarding this and those other PRs, please squash them into a single commit. A commit named "Add semicolon", "add space", etc is not adding much value to a 1 file change PR -- if you need help learning how to squash commits into one, I think any of us can point you how to do that :)

[workingjubilee]

@hkBst While we will not necessarily refuse PRs that have a remunerative motivation, we will definitely not accept degrading the quality of PRs to do so. I will accept this when you push an actual fix and it passes the standard of my review, and no sooner.

[hkBst]

@workingjubilee no remunerative motivation I can assure you. Apologies for any confusion arising from my use of the word "payout".

EDIT: I meant "payoff" when I used "payout" (in the other comment), so I guess I was unidiomatic. Again, apologies for the confusion.