HPCC-9584 Document evaluate(module, attributeId) feature

Signed-off-by: RichardTaylorHPCC <richard.taylor@lexisnexis.com>
Merge pull request #4653 from RichardTaylorHPCC/B9584

HPCC-9584 Document evaluate(module, attributeId) feature

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>