docs: fix compile errors for whitespace wrapper recipe (#1764) · rust-bakery/nom@561fb6b

The job was canceled because "nightly" failed.

trait takes 1 generic argument but 3 generic arguments were supplied

the trait bound `F: Parser<_>` is not satisfied

expected a `FnMut(_)` closure, found `F`

expected a `FnMut(&'a str)` closure, found `impl Parser<_, Output = _, Error = _>`

expected a `FnMut(_)` closure, found `F`

aborting due to 5 previous errors

The process '/home/runner/.cargo/bin/cargo' failed with exit code 101

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