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Auto merge of #148526 - reddevilmidzy:docs, r=Mark-Simulacrum
Expand pow docs with special-case tests
resolve: rust-lang/rust#148316
Files changed:
* library/std/src/num: f32.rs, f64.rs,
* powi
* powf
* library/std/src/num: f16.rs, f128.rs
* powf
* library/core/src/num: f16.rs, f128.rs
* powi
* library/core/src/num: int_macros.rs, uint_macros.rs
* checked_pow
* strict_pow
* saturating_pow
* wrapping_pow
* overflowing_pow
* pow
