[1.7.x] Fixed typo in middleware docs.
Function definition should have an ending colon. Backport of 48241ec from master
|@@ -223,7 +223,7 @@ must test for streaming responses and adjust their behavior accordingly::|
|Response middleware may wrap it in a new generator, but must not consume|
|it. Wrapping is typically implemented as follows::|
|- def wrap_streaming_content(content)|
|+ def wrap_streaming_content(content):|
|for chunk in content:|