Fix ImportRG command in AutomatedVistAConfig Doc

The command to run the ImportRG script doesn't give the correct path, as
the file location has changed.

Change the reference to be the correct location of
"Testing/Setup/ImportRG.cmake"

Change-Id: Ib286ec31576c6581fabcc0df548b95174fca28ea
OSEHRA-ID: http://issues.osehra.org/browse/OAT-121
Merge "Fix ImportRG command in AutomatedVistAConfig Doc"