CHANGE: Increase correctness of angle example in the documentation

[Neovimproved]

Summary

Just a minor discrepancy in the documentation that needs fixing (it says degrees but the angle uses the range -pi..pi)

Details

Changing the print message of the example (degrees should be radians)
Current:

// Ranged sampling:
use std::f32::consts::PI;
println!("Angle: {} degrees", rand::random_range(-PI..PI));

Revised:

// Ranged sampling:
use std::f32::consts::PI;
println!("Angle: {} radians", rand::random_range(-PI..PI));

Note: I created this issue before but it was closed since I failed to mention the location of this documentation. I initially saw it on the docs.rs documentation, https://docs.rs/rand/latest/rand/. In the code it is line 22 of src/lib.rs

Motivation

It's a mistake in the documentation that makes it look unpolished.

Alternatives

Not changing it. I guess it's easier in the short term but there might be more people like me in the future wondering why it says degrees and not radians.

[Neovimproved]

https://github.com/rust-random/rand/blob/master/src/lib.rs#L22-L22