Improve literate docs for LV

[kris-brown]

This PR addresses #45 for the LV model (not the Game of Life model).

[codecov]

Codecov Report

Attention: Patch coverage is 98.75000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 85.94%. Comparing base (1ef331a) to head (cc74664).
Report is 15 commits behind head on main.

Files	Patch %	Lines
src/incremental/Incremental.jl	98.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   85.30%   85.94%   +0.63%     
==========================================
  Files          31       31              
  Lines        1926     2020      +94     
==========================================
+ Hits         1643     1736      +93     
- Misses        283      284       +1     

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