plumbing: improve documentation (Fix #242)

[ajnavarro]

No description provided.

[codecov-io]

Codecov Report

Merging #288 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #288   +/-   ##
=======================================
  Coverage   76.88%   76.88%           
=======================================
  Files         116      116           
  Lines        7886     7886           
=======================================
  Hits         6063     6063           
  Misses       1169     1169           
  Partials      654      654

Impacted Files	Coverage Δ
plumbing/format/packfile/decoder.go	79.22% <ø> (ø)	✅
plumbing/format/pktline/encoder.go	86.36% <ø> (ø)	✅
plumbing/format/packfile/encoder.go	82.41% <ø> (ø)	✅
plumbing/format/config/section.go	87.17% <ø> (ø)	✅
plumbing/format/packfile/diff_delta.go	85.36% <ø> (ø)	✅

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