HPCC-8756 Remove DKC action from DFUPlus docs

Signed-off-by: JamesDeFabia <James.Defabia@LexisNexis.com>
Merge pull request #3940 from JamesDeFabia/RemoveDKCfromDFUPlusDocs8756

HPCC-8756 Remove DKC action from DFUPlus docs

Reviewed-By: Richard Chapman <rchapman@hpccssytems.com>