[README] Adjusting typos.

Author: Murilo Marinho

docs/README.md

@@ -158,9 +158,9 @@ Please refer to https://ros2-tutorial.readthedocs.io/en/latest/sas/index.html.
 
 The PPA for the LGPL version is available at https://smartarmstack.github.io/smart_arm_stack_ROS2/. The archive is available at https://github.com/SmartArmStack/smart_arm_stack_ROS2/releases in case you need to rely on older versions.
 
-### CC-BY-NC
+### CC BY-NC 4.0
 
-The PPA for the CC-BY-NC version is available at https://marinholab.github.io/sas_debian_builder_noncommercial/. The archive is currently private. 
+The PPA for the CC BY-NC 4.0 version is available at https://marinholab.github.io/sas_debian_builder_noncommercial/. The archive is currently private. 
 
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