update Schedulers docs

[CarloLucibello]

fix #2558

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.50%. Comparing base (7a3eafd) to head (89e1084).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2560   +/-   ##
=======================================
  Coverage   32.50%   32.50%           
=======================================
  Files          34       34           
  Lines        2003     2003           
=======================================
  Hits          651      651           
  Misses       1352     1352           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.