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.