Fix misleading docsting of shelve.open(). (GH-6427)
The protocol parameter can be any protocol supported by the
pickle module.
diff --git a/Lib/shelve.py b/Lib/shelve.py
index 4a56c93..5d443a0 100644
--- a/Lib/shelve.py
+++ b/Lib/shelve.py
@@ -235,7 +235,7 @@
filename and more than one file may be created. The optional flag
parameter has the same interpretation as the flag parameter of
dbm.open(). The optional protocol parameter specifies the
- version of the pickle protocol (0, 1, or 2).
+ version of the pickle protocol.
See the module's __doc__ string for an overview of the interface.
"""