Add FAQ on how to change the LR scheduler

[bittremieux]

Supersedes #293 because I messed up. Because there was some categorization added to the FAQ I changed the merge point to base instead of dev, but that also pulled in changes in dev to main, which we only want to do as part of a new release. When changing back to dev, that then pulled changes from main to dev, which is also undesired. Tldr: I made a mess. Easier to quickly create a new PR.

I also removed the links to specific lines of code. When we make changes in this file the links wouldn't correspond with the latest code anymore, which might lead to confusion. Instead, power users that want to change the LR schedule should be able to find the appropriate location based on the provided description.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c3d2bba) 89.54% compared to head (1d41d11) 89.54%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #294   +/-   ##
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  Coverage   89.54%   89.54%           
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  Files          12       12           
  Lines         918      918           
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  Hits          822      822           
  Misses         96       96           

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