HPCC-9193 Clarify Page 30 Inst&RunHPCC

Fix HPCC-9193 Clarify Page 30 Inst&RunHPCC
Page 30 of Installing and Running The HPCC Platform
has a section that can easily be misunderstood.
This fix clarifies the meaning of that section.

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
Merge pull request #4305 from g-pan/H9193-InRPg30

HPCC-9193 Clarify Page 30 Inst&RunHPCC

Reviewed-By: Richard Chapman <rchapman@hpccsystem.com>