add comments on compression

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[codecov]

Codecov Report

Merging #1119 (40a84d9) into main (470bc18) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1119   +/-   ##
=======================================
  Coverage   89.50%   89.50%           
=======================================
  Files         203      203           
  Lines       20231    20231           
=======================================
  Hits        18107    18107           
  Misses       2124     2124           

Impacted Files	Coverage Δ
fastfield_codecs/src/multilinearinterpol.rs	88.76% <ø> (ø)

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