Fix doc example for wrapping_abs

[TethysSvensson]

The max variable is unused. This change introduces the min_plus variable, to make the example similar to the one from saturating_abs. An alternative would be to remove the unused variable.

[rustbot]

r? @Mark-Simulacrum

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[JohnTitor]

Looking at https://doc.rust-lang.org/nightly/core/primitive.i8.html#method.wrapping_abs and https://doc.rust-lang.org/nightly/core/primitive.i8.html#method.saturating_abs, we could say min_plus is for saturating_abs. To keep consistency between primitive signed integers and non-zero ones, I'd prefer to hide MAX until the below FIXME is resolved.

[TethysSvensson]

@JohnTitor Like this?

[JohnTitor]

Yeah, thank you :)
@bors r+ rollup

[bors]

📌 Commit 00bf999 has been approved by JohnTitor

It is now in the queue for this repository.