[docs] clarify in-place can be slower for small models

[odow]

x-ref: #3267

I think this was actually compilation latency in the reverse direction.

On my first run, I got

elapsed time: 0.6746890544891357 seconds
elapsed time: 0.32920384407043457 seconds

and on my second I got

elapsed time: 0.09308099746704102 seconds
elapsed time: 0.18986296653747559 seconds

I'm not sure if it's because we've changed things in HiGHS and JuMP since I wrote the tutorial, or if it is to do with recent changes in compilation latency. But I've definitely given tutorials and talks where in-place is faster... (Perhaps it was also back when we used GLPK in the documentation?).

It seems like this could change in the future, so let's be more circumspect in how we word things going forward.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (696fa82) 98.10% compared to head (8952385) 98.10%.

Additional details and impacted files

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##           master    #3269   +/-   ##
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  Coverage   98.10%   98.10%           
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  Files          34       34           
  Lines        4704     4704           
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  Hits         4615     4615           
  Misses         89       89           

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[odow]

Thoughts @jd-foster?

https://jump.dev/JuMP.jl/previews/PR3269/tutorials/applications/power_systems/#Modifying-the-JuMP-model-in-place

[jd-foster]

Looks like the best you can do without adding a big model to the example, but the docs build time is lengthy enough as is.