docs: add section about log level on CLI

[GhostofGoes]

docs: add section about log level on CLI

Description

Add some documentation about how to configure logging levels in phenix from the CLI, to help with troubleshooting.

Related Issue

N/A

Type of Change

Please select the type of change your pull request introduces:

• Bugfix
• New feature
• Documentation update
• Other (please describe):

Checklist

• This PR conforms to the process detailed in the Contributing Guide.
• I have included no proprietary/sensitive information in my code.
• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have tested my code.

Additional Notes

N/A