Tutorial examples are incomplete

Please complete the following tasks

[X] I have searched the discussions
[X] I have searched the open and rejected issues

rust version

1.79.0

winnow version

0.6.15

Minimal reproducible code

See next.

Steps to reproduce the bug with the above code

Some of the code in the tutorial is incomplete. For example, at https://docs.rs/winnow/latest/winnow/_tutorial/chapter_2/index.html there is this program:

use winnow::token::take_while;

fn parse_digits<'s>(input: &mut &'s str) -> PResult<&'s str> {
    take_while(1.., ('0'..='9', 'a'..='f', 'A'..='F')).parse_next(input)
}

fn main() {
    let mut input = "1a2b Hello";

    let output = parse_digits.parse_next(&mut input).unwrap();
    assert_eq!(input, " Hello");
    assert_eq!(output, "1a2b");

    assert!(parse_digits.parse_next(&mut "Z").is_err());
}

but it does not compile. It needs these two lines added at the top:

use winnow::Parser;
use winnow::PResult;

Actual Behaviour

Put this in a main.rs file and run cargo check. This error results:

error[E0412]: cannot find type `PResult` in this scope
   --> src/main.rs:3:45
    |
3   | fn parse_digits<'s>(input: &mut &'s str) -> PResult<&'s str> {
    |                                             ^^^^^^^
    |
   ::: C:\Users\pexat\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib/rustlib/src/rust\library\core\src\result.rs:502:1
    |
502 | pub enum Result<T, E> {
    | --------------------- similarly named enum `Result` defined here
    |
help: an enum with a similar name exists
    |
3   | fn parse_digits<'s>(input: &mut &'s str) -> Result<&'s str> {
    |                                             ~~~~~~
help: consider importing this type alias
    |
1   + use winnow::PResult;
    |

Expected Behaviour

Should compile without errors.

Additional Context

No response

winnow-rs / winnow

Tutorial examples are incomplete #571