HPCC-12137 Enhance embedded MySQL example

Signed-off-by: Jim DeFabia <jamesdefabia@lexisnexis.com>
HPCC-12137 Edits based upon review

Signed-off-by: Jim DeFabia <jamesdefabia@lexisnexis.com>
Merge pull request #6380 from JamesDeFabia/EnhancedEmbedSamples

HPCC-12137 Enhance embedded MySQL example

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>