Fix parameter name in docstrings (#244)

openshift/dynamic/client.py

@@ -271,7 +271,7 @@ def watch(self, resource, namespace=None, name=None, label_selector=None, field_
         :param namespace: The namespace to query
         :param name: The name of the resource instance to query
         :param label_selector: The label selector with which to filter results
-        :param label_selector: The field selector with which to filter results
+        :param field_selector: The field selector with which to filter results
         :param resource_version: The version with which to filter results. Only events with
                                  a resource_version greater than this value will be returned
         :param timeout: The amount of time in seconds to wait before terminating the stream