docs: fix simple typo, propery -> property

There is a small typo in kombu/asynchronous/http/base.py.

Should read `property` rather than `propery`.

kombu/asynchronous/http/base.py

@@ -191,7 +191,7 @@ def body(self):
         """The full contents of the response body.
 
         Note:
-            Accessing this propery will evaluate the buffer
+            Accessing this property will evaluate the buffer
             and subsequent accesses will be cached.
         """
         if self._body is None: