Update solver documentation

[jajhall]

This page will be correct when cuPDLP-C is replaced by HiPDLP, and the QP IPM solver is added, so this is just a draft PR

[jajhall]

Closes #2781

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.32%. Comparing base (382c51e) to head (facd1d7).
⚠️ Report is 19 commits behind head on latest.

Additional details and impacted files

@@           Coverage Diff           @@
##           latest    #2787   +/-   ##
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  Coverage   80.31%   80.32%           
=======================================
  Files         348      348           
  Lines       86093    86095    +2     
=======================================
+ Hits        69148    69156    +8     
+ Misses      16945    16939    -6     

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[jajhall]

Closes #2752

[filikat]

In definitions.md for option solver, should there be both "pdlp" and "hipdlp"? The option for "pdlp" should also coincide with what is used in the Summary of solvers.md.
It seems like you removed the statements "Setting the solver option to ... forces the ... solver to be used" from the LP section, since they are now present in the summary. But they still appear in the QP section. For consistency, it may be better to remove them from there as well.

[jajhall]

In definitions.md for option solver, should there be both "pdlp" and "hipdlp"? The option for "pdlp" should also coincide with what is used in the Summary of solvers.md.

Yes, the "hipdlp" value for solver is still in Yanyu's branch, so that she can run cuPDLPc (by setting "pdlp") for sanity checking, but it will disappear when we have only her PDLP solver

It seems like you removed the statements "Setting the solver option to ... forces the ... solver to be used" from the LP section, since they are now present in the summary. But they still appear in the QP section. For consistency, it may be better to remove them from there as well.

Indeed, I've updated solvers.md

[jajhall]

Documentation is fixed