add fixes to docs

[Fe-r-oz]

Since the docs are now rendering at https://doc.quantumsavory.org/QuantumExpanders.jl/dev/API/, time to fix the docs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.15%. Comparing base (bc60f63) to head (99a8961).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #71   +/-   ##
=======================================
  Coverage   95.15%   95.15%           
=======================================
  Files           8        8           
  Lines         763      763           
=======================================
  Hits          726      726           
  Misses         37       37           

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