HPCC-8823 Fix of Scheduler Doc

Fix HPCC-8823 Fix Incluer errors
in Ecl Scheduler Doc : Emergency fix

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
Merge branch 'H8823-SchedFix' into candidate-3.10.4

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>