Add extra note for left, right and none functions in pratt.rs example

[whiskeyo]

No description provided.

[zesterer]

What is the goal with this PR?

[whiskeyo]

I considered it to be a bit more user-friendly for pratt feature users, since infix takes Associativity as its argument and the direct usage of Associativity::Right(3) might be a bit easier to understand at first than right(3), which is a some kind of helper function.

[zesterer]

Hmm, I'm not sure I necessarily agree with that assessment. The docs are quite clear as to what each function does. It's not that I have a strong opinion either way though.

[whiskeyo]

That's true. If you feel like this shouldn't be merged, I am not against it and I fully get it, but for me it was quite magic at first when I saw the example 😄

Maybe the example could mention something like:

/// `left`, `right` and `none` are shorthand versions of `Associativity` variants

just before they are used, and the proposed change would be then restored back to the original?

[zesterer]

I'd be happy to accept that change, yes

[zesterer]

Thanks!