Improve the docstring of random.shuffle. Inform users not to provide int arg.
Addresses issue #14927
diff --git a/Lib/random.py b/Lib/random.py
index af04ab2..6fa1c05 100644
--- a/Lib/random.py
+++ b/Lib/random.py
@@ -278,6 +278,8 @@
 
         Optional arg random is a 0-argument function returning a random
         float in [0.0, 1.0); by default, the standard random.random.
+
+        Do not supply the 'int' argument.
         """
 
         if random is None: