vacant doc fixes; closes #407

[petrelharp]

Thanks!

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.83%. Comparing base (ebae16c) to head (3165229).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #408   +/-   ##
=======================================
  Coverage   96.83%   96.83%           
=======================================
  Files           8        8           
  Lines         789      789           
  Branches      146      146           
=======================================
  Hits          764      764           
  Misses         15       15           
  Partials       10       10           

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