Prevent OS modules of being hidden during docs-build

[Miauwkeru]

• Stop skipping OS modules during docs-build
• Add docstring to ConfigNode and FortiOSConfig

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.06%. Comparing base (6117402) to head (4c3e021).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1297   +/-   ##
=======================================
  Coverage   81.06%   81.06%           
=======================================
  Files         402      402           
  Lines       35244    35244           
=======================================
  Hits        28571    28571           
  Misses       6673     6673           

Flag	Coverage Δ
unittests	81.06% <ø> (ø)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 12 untouched benchmarks

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_{Comparing enable-os-checks (4c3e021) with main (6117402)}

[Schamper]

What's the status of this?

[Miauwkeru]

What's the status of this?

It needs a review, but fell through the cracks when being busy with other stuff

[Schamper]

I don't think the title accurately reflects the changes? Nothing is "enabled", it's rather a "prevent OS plugins from being hidden".