Documentation for `usize::wrapping_sub` mentions undeclared variable

[jeehoonkang]

Here, "Computes self - other" should be "Computes self - rhs":

rust/src/libcore/num/mod.rs

Line 644 in dbeb5bf

/// Wrapping (modular) subtraction. Computes `self - other`,

Similarly for many other methods for usize.

[frewsxcv]

opened a fix for this: https://github.com/rust-lang/rust/pull/46473/files