Enable OS modules during docs-build

[Miauwkeru]

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

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 80.61%. Comparing base (459d464) to head (c98380f). :warning: Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1297      +/-   ##
==========================================
+ Coverage   80.59%   80.61%   +0.01%     
==========================================
  Files         374      374              
  Lines       33112    33112              
==========================================
+ Hits        26686    26692       +6     
+ Misses       6426     6420       -6     

Flag	Coverage Δ
unittests	80.61% <ø> (+0.01%)	:arrow_up:

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[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #1297 will not alter performance

_{Comparing enable-os-checks (c98380f) with main (459d464)}

Summary

✅ 8 untouched benchmarks