HPCC-8844 Document LOCAL keyword

Signed-off-by: RichardTaylorHPCC <richard.taylor@lexisnexis.com>
Merge branch 'candidate-4.0.2' of github.com:hpcc-systems/HPCC-Platform into B8844
HPCC-8844 Document LOCAL keyword

Signed-off-by: RichardTaylorHPCC <richard.taylor@lexisnexis.com>
Merge pull request #4751 from RichardTaylorHPCC/B8844

HPCC-8844 Document LOCAL keyword

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>