fix documentation for baseFlowController.UpdateSendWindow

[marten-seemann]

No description provided.

[codecov]

Codecov Report

Merging #3087 (48a4576) into master (3bce408) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3087      +/-   ##
==========================================
- Coverage   85.72%   85.71%   -0.01%     
==========================================
  Files         131      131              
  Lines        9520     9520              
==========================================
- Hits         8161     8160       -1     
- Misses        990      991       +1     
  Partials      369      369              

Impacted Files	Coverage Δ
internal/flowcontrol/base_flow_controller.go	100.00% <ø> (ø)
internal/utils/rand.go	62.50% <0.00%> (-12.50%)	⬇️

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