Added some missing interface explanations to devdocs

[ba2tro]

No description provided.

[codecov]

Codecov Report

Merging #43 (a145bca) into master (29d87e4) will decrease coverage by 0.94%.
Report is 8 commits behind head on master.
The diff coverage is 56.75%.

❗ Current head a145bca differs from pull request most recent head 1e0907d. Consider uploading reports for the commit 1e0907d to get more accurate results

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   65.15%   64.22%   -0.94%     
==========================================
  Files          23       23              
  Lines         927      981      +54     
==========================================
+ Hits          604      630      +26     
- Misses        323      351      +28     

Files	Coverage Δ
src/QuantumSavory.jl	59.68% <ø> (+0.77%)	⬆️
src/backends/quantumoptics/express.jl	50.00% <100.00%> (ø)
src/backends/quantumoptics/quantumoptics.jl	88.37% <100.00%> (+0.27%)	⬆️
src/baseops/traceout.jl	89.13% <83.33%> (ø)
src/CircuitZoo/CircuitZoo.jl	66.30% <54.34%> (-5.32%)	⬇️

... and 2 files with indirect coverage changes

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