Fix Sphinx rst warnings

[JSCU-CNI]

Fixes #47.

[Schamper]

Could you also move the APM, BSD, GPT and MBR test files to tests/_data/disk?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.98%. Comparing base (313b10d) to head (3d273b4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #48   +/-   ##
=======================================
  Coverage   76.98%   76.98%           
=======================================
  Files          29       29           
  Lines        2381     2381           
=======================================
  Hits         1833     1833           
  Misses        548      548           

Flag	Coverage Δ
unittests	76.98% <ø> (ø)

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