HPCC-8576 - Minor change to tooltip for globalMemorySize

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
Merge pull request #3875 from jakesmith/hpcc-8576

HPCC-8576 - Minor change to tooltip for globalMemorySize

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>