HPCC-11700 Update Scheduler Docs for ECL Watch 5

Signed-off-by: Jim DeFabia <jamesdefabia@lexisnexis.com>
Merge pull request #6213 from JamesDeFabia/11700UpdateSchedulerDoc

HPCC-11700 Update Scheduler Docs for ECL Watch 5

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>