HPCC-9164 Add Delimited format to DFUPlus docs

Signed-off-by: JamesDeFabia <James.Defabia@LexisNexis.com>
Merge pull request #4310 from JamesDeFabia/hpcc9164_DFUPlusDelimitedFormat

HPCC-9164 Add Delimited format to DFUPlus docs

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>