Fix post_uri parameter name on docstring

Author: Jorge-Rodriguez

SoftLayer/managers/hardware.py

@@ -268,7 +268,7 @@ def reload(self, hardware_id, post_uri=None, ssh_keys=None):
         """Perform an OS reload of a server with its current configuration.
 
         :param integer hardware_id: the instance ID to reload
-        :param string post_url: The URI of the post-install script to run
+        :param string post_uri: The URI of the post-install script to run
                                 after reload
         :param list ssh_keys: The SSH keys to add to the root user
         """