Fix docs error

[aken830806]

Reference django_q/conf.py

[codecov]

Codecov Report

Merging #563 (cecc53e) into master (981ba0c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #563   +/-   ##
=======================================
  Coverage   90.18%   90.18%           
=======================================
  Files          50       50           
  Lines        3280     3280           
=======================================
  Hits         2958     2958           
  Misses        322      322           

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[Koed00]

Thanks for spotting :)