`output.no_color` is missing from the spec

[kittaakos]

Describe the problem

It is not in the spec but is part of the default config dump:

output:
  no_color: false

To reproduce

• Visit the spec: https://arduino.github.io/arduino-cli/latest/configuration/#configuration-keys
• It's not documented

Expected behavior

All available CLI config keys are documented

Arduino CLI version

2b8d6d7

Operating system

macOS

Operating system version

12.5.1

Additional context

No response

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the nightly build
• My report contains all necessary details