docs: added documentation for assets path #377

Job	Run time
check-paths	9s
pythonpackage	3m 16s
build_cpp_extensions (rcs_robotics_library)	3m 37s
build_cpp_extensions (rcs_fr3)	5m 4s
build_cpp_extensions (rcs_panda)	4m 4s
build_cpp_extensions (rcs_so101)	4m 39s
build_extensions (rcs_tacto)	2m 27s
build_extensions (rcs_xarm7)	1m 58s
build_extensions (rcs_robotiq2f85)	2m 15s
build_extensions (rcs_realsense)	2m 12s
build_extensions (rcs_usb_cam)	2m 7s
	31m 48s

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