HPCC-11436 DOCS: Update Installing and Running for ECLWatch

Fix HPCC-11436 DOCS: Update Installing and Running for ECLWatch
doc changes reflecting the running steps through new ECL Watch.

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
Merge pull request #6207 from g-pan/H11436-InstNRunfor50

HPCC-11436 DOCS: Update Installing and Running for ECLWatch

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>