Updated VisIt documentation
Updated VisIt documentation

Updated the VisIt documentation to give the easier path for a VisIt
installation, instead of having to specify the path inside of VisIt.app.

Signed-off-by: Robert Smith <22c25089779475e35eafae66ad8a8e3c15f3fa55@ornl.gov>
eclipse/ice,eclipse/ice,eclipse/ice,eclipse/ice,eclipse/ice,eclipse/ice