Update swig docs

[eddiebergman]

This PR updates the docs to reflect that pyrfr now works with that latest swig version SWIG 4.0.2 and no extra installation step is required to specifically link to SWIG 3.0.0

[codecov]

Codecov Report

Merging #1242 (8b1c042) into development (0f03651) will increase coverage by 0.01%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #1242      +/-   ##
===============================================
+ Coverage        88.22%   88.24%   +0.01%     
===============================================
  Files              139      139              
  Lines            11034    11034              
===============================================
+ Hits              9735     9737       +2     
+ Misses            1299     1297       -2     

Impacted Files	Coverage Δ
autosklearn/pipeline/implementations/util.py	81.25% <0.00%> (-3.13%)	⬇️
autosklearn/util/logging_.py	88.96% <0.00%> (+0.68%)	⬆️
...ipeline/components/regression/gradient_boosting.py	93.26% <0.00%> (+1.92%)	⬆️

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