HPCC-10338 Documenrt UPDATE option on BUILD and OUTPUT

Signed-off-by: JamesDeFabia <James.Defabia@LexisNexis.com>
HPCC-10338 Document UPDATE option on BUILD and OUTPUT

Signed-off-by: JamesDeFabia <James.Defabia@LexisNexis.com>
Merge pull request #6036 from JamesDeFabia/10338DocsUPDATE_on_BUILD_and_OUTPUT

HPCC-10338 Document UPDATE option on BUILD and OUTPUT

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>