Document configuration generics

[trevyn]

Closes #559

[codecov]

Codecov Report

Base: 54.21% // Head: 55.66% // Increases project coverage by +1.45% 🎉

Coverage data is based on head (3630c2f) compared to base (92f4d00).
Patch has no changes to coverable lines.

❗ Current head 3630c2f differs from pull request most recent head e1c07f5. Consider uploading reports for the commit e1c07f5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk     #581      +/-   ##
==========================================
+ Coverage   54.21%   55.66%   +1.45%     
==========================================
  Files          50       50              
  Lines        4429     4313     -116     
==========================================
  Hits         2401     2401              
+ Misses       2028     1912     -116     

Impacted Files	Coverage Δ
src/config.rs	82.60% <ø> (ø)
src/enc/impl_tuples.rs	100.00% <0.00%> (+69.04%)	⬆️

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[VictorKoenders]

LGTM, thanks!