[docs] add feasibility cuts to Benders decomposition

[odow]

I've changed to a more realistic example, since the Matrix input was a bit misleading. I've also added feasibility cuts (at the end, to keep the initial developments simpler).

Preview: https://jump.dev/JuMP.jl/previews/PR3833/tutorials/algorithms/benders_decomposition/

x-ref #2348 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.90%. Comparing base (563cb63) to head (2a1ab90).
Report is 1 commits behind head on master.

Additional details and impacted files

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##           master    #3833   +/-   ##
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  Coverage   97.90%   97.90%           
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  Files          44       44           
  Lines        6019     6019           
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  Hits         5893     5893           
  Misses        126      126           

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[trulsf]

Thanks for these updates! I was looking at this example to find out how to add feasibility cuts in Benders' a few days ago and suddenly they are here :)