Merge pull request #2296 from bdarnell/docs

docs: Small updates

tornado/ioloop.py

@@ -244,7 +244,7 @@ class IOLoop(Configurable):
            Previously, this method would clear the `IOLoop` used as
            the global singleton by `IOLoop.instance()`. Now that
            `instance()` is an alias for `current()`,
-           `clear_instance()` is an alias for `clear_instance()`.
+           `clear_instance()` is an alias for `clear_current()`.
 
         .. deprecated:: 5.0
 

tornado/web.py

@@ -1220,6 +1220,11 @@ class RequestHandler(object):
 
         See http://en.wikipedia.org/wiki/Cross-site_request_forgery
 
+        This property is of type `bytes`, but it contains only ASCII
+        characters. If a character string is required, there is no
+        need to base64-encode it; just decode the byte string as
+        UTF-8.
+
         .. versionchanged:: 3.2.2
            The xsrf token will now be have a random mask applied in every
            request, which makes it safe to include the token in pages

tornado/websocket.py

@@ -17,7 +17,6 @@ the protocol (known as "draft 76") and are not compatible with this module.
 """
 
 from __future__ import absolute_import, division, print_function
-# Author: Jacob Kristhammar, 2010
 
 import base64
 import collections