Minor PR adding some code comments

[ValarDragon]

Closes: #XXX

Description

Went through some of the superfluid code with @xBalbinus , left some comments during the discussion. Just PR'ing them

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

[codecov-commenter]

Codecov Report

Merging #1101 (0484ccc) into main (86b4836) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1101      +/-   ##
==========================================
+ Coverage   20.91%   20.94%   +0.02%     
==========================================
  Files         199      199              
  Lines       25426    25429       +3     
==========================================
+ Hits         5319     5326       +7     
+ Misses      19144    19140       -4     
  Partials      963      963              

Impacted Files	Coverage Δ
x/superfluid/keeper/stake.go	58.13% <ø> (ø)
x/superfluid/module.go	60.41% <0.00%> (+0.84%)	⬆️
x/lockup/module.go	56.81% <0.00%> (+1.00%)	⬆️
x/incentives/module.go	55.55% <0.00%> (+1.01%)	⬆️
x/superfluid/keeper/msg_server.go	4.54% <0.00%> (+4.54%)	⬆️
x/incentives/keeper/msg_server.go	7.14% <0.00%> (+7.14%)	⬆️

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