HPCC-12162 DOCS:ECL Watch Match UI changes

FIX HPCC-12162 DOCS:ECL Watch Match UI changes
Update documentation for Workunit details in ECL Watch
Playground tab is no longer there, instead we have ECL tab.

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
Merge pull request #6613 from g-pan/H12162-ECLPlgd

HPCC-12162 DOCS:ECL Watch Match UI changes

Reviewed-By: Jim DeFabia <james.defabia@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>