docs: improve readability on how to choose license

Author: msclock

copier.yaml

@@ -132,7 +132,7 @@ default_py:
 
 copyright_license:
   type: str
-  help: Your project's license
+  help: Your project's license. If you have no idea how to choose one, please see https://choosealicense.com/.
   default: MIT License
   choices:
     - Academic Free License v3.0