Minor PR adding some code comments (backport #1101)

[mergify]

This is an automatic backport of pull request #1101 done by Mergify.

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[codecov-commenter]

Codecov Report

Merging #1102 (6c8842f) into v7.x (5b4adf7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             v7.x    #1102   +/-   ##
=======================================
  Coverage   20.86%   20.86%           
=======================================
  Files         199      199           
  Lines       25416    25416           
=======================================
  Hits         5303     5303           
  Misses      19150    19150           
  Partials      963      963           

Impacted Files	Coverage Δ
x/superfluid/keeper/stake.go	53.48% <ø> (ø)

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