HPCC-8568 Fix Docs for HAVING

Signed-off-by: JamesDeFabia <James.Defabia@LexisNexis.com>
Merge pull request #6012 from JamesDeFabia/8568FixDocsForHAVING

HPCC-8568 Fix Docs for HAVING

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>