[docs] update The diet problem

[odow]

I'm giving a few tutorials in October at https://cermics-lab.enpc.fr/seso2023/ and https://julia-users-paris.github.io/workshop/en/.

My plan is to work through a few of these examples, with little exercises at the bottom for people to try. I think it makes sense to add these to the JuMP documentation.

x-ref #3459

Preview: https://jump.dev/JuMP.jl/previews/PR3460/tutorials/linear/diet/

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (9ba15d0) 98.00% compared to head (b40278a) 98.00%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3460   +/-   ##
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  Coverage   98.00%   98.00%           
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  Files          36       36           
  Lines        5068     5069    +1     
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+ Hits         4967     4968    +1     
  Misses        101      101           

see 1 file with indirect coverage changes

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