Doc: RemoveDo is incomplete

[akimd]

Hi,

That's a very minor detail, but it might be worth fixing for sake of newcomers. The RemoveDo example does not recurse in the body of while loops, so it fails to process nested loops.

Adding a super should suffice.

Cheers!

[akimd]

(Also, FWIW, using <<-RUBY rather than EOF is more conformant to RuboCop's recommended practice.)

[akimd]

Also, the doc pointed to, https://whitequark.github.io/parser/, is completely outdated. Maybe it could be updated automatically using GitHub actions?