Improved decoding documentation

[jorgecarleitao]

Also simplified their internal code

[codecov-commenter]

Codecov Report

Merging #180 (a124712) into main (f11f3d9) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #180      +/-   ##
==========================================
- Coverage   85.32%   85.32%   -0.01%     
==========================================
  Files          82       82              
  Lines        8110     8108       -2     
==========================================
- Hits         6920     6918       -2     
  Misses       1190     1190              

Impacted Files	Coverage Δ
src/encoding/delta_bitpacked/decoder.rs	99.22% <ø> (ø)
src/encoding/hybrid_rle/mod.rs	98.31% <ø> (-0.05%)	⬇️
src/encoding/mod.rs	100.00% <ø> (ø)
src/encoding/hybrid_rle/bitmap.rs	98.48% <100.00%> (-0.03%)	⬇️
src/encoding/hybrid_rle/decoder.rs	94.56% <100.00%> (+0.24%)	⬆️

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