docs: add KelkooGroup to users list

[gaeljw]

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• The title of the PR states what changed and the related issues number (used for the release note).
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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (696631e) 49.06% compared to head (7a9487e) 49.06%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #13095   +/-   ##
=======================================
  Coverage   49.06%   49.06%           
=======================================
  Files         246      246           
  Lines       42561    42561           
=======================================
  Hits        20881    20881           
  Misses      19565    19565           
  Partials     2115     2115           

see 1 file with indirect coverage changes

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[crenshaw-dev]

Thanks, @gaeljw!