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>

@JamesDeFabia please review