spinner curio example in chapter 18b

Author: ramalho

18b-async-await/spinner_curio.py

@@ -6,7 +6,7 @@
 # Example from the book Fluent Python by Luciano Ramalho inspired by
 # Michele Simionato's multiprocessing example in the python-list:
 # https://mail.python.org/pipermail/python-list/2009-February/538048.html
-# using David Beazley's `curio` library:
+# ported to use David Beazley's `curio` library:
 # https://github.com/dabeaz/curio
 
 import curio