Update v1 and v2 network config docs to clarify MAC addresses

[dermotbradley]

Proposed Commit Message

Update v1 and v2 network config docs to clarify when MAC addresses should be quoted.

Also update MAC addresses used in testcases to remove quotes where not
required and add single quotes where quotes are required.

Additional Context

MAC addresses consisting of only 0-9 digits may be misintepreted as YAML Base 60 numbers if not quoted.

See YAML reference for definition of a Base 60 number.

Test Steps

Existing testcases are adequate.

Checklist:

• My code follows the process laid out in the documentation
• I have updated or added any unit tests accordingly
• I have updated or added any documentation accordingly

[OddBloke]

Thanks for chasing this all down, Dermot, it's been quite the adventure! If we're ever at a conference together, I owe you 00:00:00:00:00:01 beverages of your choosing. (I have a couple of thoughts inline.)

[igalic]

🙋🏻‍♀️

[OddBloke]

LGTM, with one minor formatting issue. I'll apply that fix then land this. Thank you!