HPCC-12487 Fix unresolved links in ECL Watch doc

Signed-off-by: Jim DeFabia <jamesdefabia@lexisnexis.com>
HPCC-12487 Edits from feedback

Signed-off-by: Jim DeFabia <jamesdefabia@lexisnexis.com>
Merge pull request #6586 from JamesDeFabia/12487DocsUnresolvedLinks

HPCC-12487 Fix unresolved links and missing image in ECLWatch doc

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>