HPCC-12479 Document using MODULE to return multiple values from a FUNCTION

Signed-off-by: Jim DeFabia <jamesdefabia@lexisnexis.com>
HPCC-12479 Minor edit based upon review

Signed-off-by: Jim DeFabia <jamesdefabia@lexisnexis.com>
Merge pull request #6585 from JamesDeFabia/12479DocsModuleInFunction

HPCC-12479 Document using MODULE to return multiple values from a FUNCTION

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>