Fix spelling mistake

(cherry picked from commit d8956a8)

Author: LilSpazJoekp

CHANGES.rst

@@ -7,7 +7,7 @@ Unreleased
 **Added**
 
 - 301 redirects result in a ``Redirect`` exception.
-- ``Requestor`` is now initialzed with a ``timeout`` parameter.
+- ``Requestor`` is now initialized with a ``timeout`` parameter.
 - ``ScriptAuthorizer``, ``ReadOnlyAuthorizer``, and ``DeviceIDAuthorizer`` have a
   new parameter, ``scopes``, which determines the scope of access requests.
 - Retry 408 "Request Timeout" HTTP responses.