More docstring updates
diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 369bde9..d6dce6d 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -264,7 +264,8 @@
Even though IOBase does not declare read, readinto, or write because
their signatures will vary, implementations and clients should
consider those methods part of the interface. Also, implementations
- may raise a IOError when operations they do not support are called.
+ may raise UnsupportedOperation when operations they do not support are
+ called.
The basic type used for binary data read from or written to a file is
bytes. bytearrays are accepted too, and in some cases (such as