docs: Update logging doc, add info on thresholds

[paulgessinger]

This mainly adds information on the logging thresholds configuration.

[codecov]

Codecov Report

Merging #1520 (a0ada34) into main (df05834) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main    #1520   +/-   ##
=======================================
  Coverage   48.58%   48.58%           
=======================================
  Files         381      381           
  Lines       20629    20651   +22     
  Branches     9464     9476   +12     
=======================================
+ Hits        10023    10034   +11     
+ Misses       4066     4064    -2     
- Partials     6540     6553   +13     

Impacted Files	Coverage Δ
Core/include/Acts/Utilities/Logger.hpp	56.97% <0.00%> (-0.68%)	⬇️
Core/src/Utilities/Logger.cpp	30.43% <0.00%> (ø)
...e/include/Acts/EventData/VectorMultiTrajectory.hpp	52.89% <0.00%> (-2.66%)	⬇️
...re/include/Acts/TrackFitting/GaussianSumFitter.hpp	69.18% <0.00%> (-1.17%)	⬇️
.../include/Acts/TrackFitting/detail/GsfSmoothing.hpp	35.05% <0.00%> (-0.37%)	⬇️
Core/include/Acts/Vertexing/ZScanVertexFinder.hpp	81.81% <0.00%> (ø)
...e/include/Acts/Vertexing/IterativeVertexFinder.hpp	82.35% <0.00%> (ø)
...clude/Acts/Vertexing/AdaptiveMultiVertexFinder.hpp	78.57% <0.00%> (ø)
...clude/Acts/Vertexing/AdaptiveMultiVertexFitter.hpp	72.00% <0.00%> (ø)
Core/include/Acts/TrackFitting/detail/GsfActor.hpp	42.58% <0.00%> (+0.21%)	⬆️
... and 5 more

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[benjaminhuth]

Very nice and understandable. After reading through, I found that there is one part where I would expect a link or something to CustomDefaultLogger.cpp in line 128.

This is not in the part that you changed, but maybe you could add a link here @paulgessinger?

[paulgessinger]

Added now, @benjaminhuth.

[paulgessinger]

Minor change since @benjaminhuth's approval. I'll merge this.