Update the Debugging Rails Guide
Update the Debugging Rails Guide

[skip ci].

- Update to the current output when running `byebug help`.

- Remove the alias `exit` because it does not work and seems to have
been removed from Byebug, as confirmed by the source code here:
https://github.com/deivid-rodriguez/byebug/blob/master/lib/byebug/comman
ds/quit.rb

- Added the useful `q!` instead to avoid the "Really quit? (y/n)"
prompt.

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