doc: TOML keys *can* contain dots, you just need to quote them

[birkenfeld]

No description provided.

[gdesmott]

Thanks for your patch. Could you please add a test for this so we can ensure it works (and keep working)?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.11%. Comparing base (60414c9) to head (e571756).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #140   +/-   ##
=======================================
  Coverage   91.11%   91.11%           
=======================================
  Files           3        3           
  Lines        2093     2093           
=======================================
  Hits         1907     1907           
  Misses        186      186           

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