Update tcar_printHelp file.
- Previously, the tcar_printHelp function failed to print script
documentation. The condition set when tcar_printHelp message is
called from centos-art.sh script isn't retrieving the correct
documentation name. This update changes the tcar_printHelp.sh file
to retrieve the correct documentation file when tcar_printHelp is
called from centos-art.sh script and there isn't any module name
defined yet.