No example of continuing a specific labeled loop

[CoolCat467]

• I have searched open and closed issues and pull requests for duplicates, using these search terms:
  • "labeled loop continue"
  • "continuing labeled loop"
  • "continuing loop with label"
• I have checked the latest main branch to see if this has already been fixed, in this file:
  • src/ch03-05-control-flow.md

URL to the section(s) of the book with this problem:
https://github.com/rust-lang/book/blob/main/src/ch03-05-control-flow.md
https://doc.rust-lang.org/book/ch03-05-control-flow.html

Description of the problem:
There are no examples on continuing a higher up labeled loop when there are nested loops.
Ex

'one: loop {
    'two: loop {
        continue; // How to continue `'one` instead of `'two`?
    }
}

Suggested fix:
Adding section on how continue can take an optional label and continue the loop with that label instead of just the current loop scope.

[chriskrycho]

Thanks for this and #3820. I think we probably don’t want to add more example code here, but maybe we can sneak in a sentence which says that continue and break work the same way with loop labels as they do without them (worded better than this, of course!). That would minimize the change to the text while still conveying the info.