docs: Add example "Run parallel crawlers"

[Mantisus]

Description

• Add example "Run parallel crawlers".

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.49%. Comparing base (e201147) to head (e834eb2).
⚠️ Report is 14 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1623      +/-   ##
==========================================
+ Coverage   92.46%   92.49%   +0.02%     
==========================================
  Files         157      157              
  Lines       10421    10421              
==========================================
+ Hits         9636     9639       +3     
+ Misses        785      782       -3     

Flag	Coverage Δ
unit	92.49% <ø> (+0.02%)	⬆️

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[janbuchar]

Nice, thanks!

[vdusek]

great, thanks 🙂