AsciiExt docs are incorrect

[steveklabnik]

https://doc.rust-lang.org/stable/std/ascii/trait.AsciiExt.html

Extension methods for ASCII-subset only operations on string slices.

but at the bottom

    impl AsciiExt for str
    impl AsciiExt for [u8]
    impl AsciiExt for u8
    impl AsciiExt for char

That is, they are not just for string slices, but also for u8 slices, u8, and char.

I'm not sure what the right wording is here, exactly, maybe just drop the whole 'on string slices' bit.

I'm happy to mentor anyone who wants to tackle this issue.

[alanstoate]

I'm interested in working on this

[steveklabnik]

@alanstoate awesome! please let me know if you need any help at all, very happy to do so.

[alanstoate]

@steveklabnik since all the examples on that page are using char's would it be worth updating one or two to show other types being used?

e.g

let ascii_uint = 97;         // 97 represents ascii 'a'

assert_eq!(65, ascii_uint.to_ascii_uppercase()) // 65 represents ascii 'A'

[steveklabnik]

That'd be nice as well, yeah

[mrhota]

@steveklabnik looks like the linked PR is merged, so maybe you can close this?