Enable RTT output

[henrygab]

Fixes #113

[henrygab]

Hmm.... not seeing the expected output. It might be as simple as not having the debug output level set. Still, setting PR to draft mode until can verify....

🎉 Huzzah! The issue was only documentation! 🎉

Fixes to the documentation include:

1. Include the all-important rtt start
2. Add a single block for the commands to enable/run RTT, which can be copied/pasted directly into the second terminal / shell.
3. Fix search size (was missing a zero...)