HPCC-11880 Update Data Handling manual for ECL Watch 5

Signed-off-by: Jim DeFabia <jamesdefabia@lexisnexis.com>
Merge pull request #6209 from JamesDeFabia/11880UpdateDataHandling

HPCC-11880 Update Data Handling manual for ECL Watch 5

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>