Fix trailing whitespace

Author: davidfstr

Doc/library/http.client.rst

@@ -292,7 +292,7 @@ HTTPConnection Objects
    and iterables in general) will be chunk-encoded, and the
    Transfer-Encoding header will automatically be set instead of
    Content-Length.
-   
+
    .. note::
       When using most HTTP methods (like ``GET`` or ``POST``)
       the provided ``uri`` must be an absolute path and