added module docstring and removed unneeded import

ur_rtde_driver/scripts/tool_communication

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
+"""Small helper script to start the tool communication interface"""
 
-import os
 import subprocess
 import rospy
 
@@ -18,7 +18,6 @@ def main():
     # Additionally, a symlink at the given location will be created. Use an absolute path here.
     local_device = rospy.get_param("~device_name")
 
-
     rospy.loginfo("Remote device is available at '" + local_device + "'")
 
     cfg_params = ["pty"]