HPCC-10422 DOCS:ECL Scheduler and Certify updates

Fix HPCC-10422 DOCS:ECL Scheduler and Certify updates
Update Scheduler and Certify docs for the new ECL Watch

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
Merge pull request #6072 from g-pan/H10422-UpdateCertifyfor50

HPCC-10422 DOCS: Certify updates for 5.0

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>