[docs] add more tips and tricks for linear programs

[odow]

Part of #2348

Preview: https://jump.dev/JuMP.jl/previews/PR3144/tutorials/linear/tips_and_tricks/

[codecov]

Codecov Report

Base: 97.68% // Head: 97.68% // No change to project coverage 👍

Coverage data is based on head (d982912) compared to base (9b4c880).
Patch has no changes to coverable lines.

❗ Current head d982912 differs from pull request most recent head e5cc3e2. Consider uploading reports for the commit e5cc3e2 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3144   +/-   ##
=======================================
  Coverage   97.68%   97.68%           
=======================================
  Files          33       33           
  Lines        4456     4456           
=======================================
  Hits         4353     4353           
  Misses        103      103           

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