fix #1008: fix autodoc documenter resolve ordering.

note: MethodDocumenter and FunctionDocumenter is same priority then
Documenter.format_signature() choice documenter is not stable
(depend on memory condition?).

sphinx/ext/autodoc.py

@@ -1105,7 +1105,7 @@ class MethodDocumenter(DocstringSignatureMixin, ClassLevelDocumenter):
     """
     objtype = 'method'
     member_order = 50
-    priority = 0
+    priority = 1
 
     @classmethod
     def can_document_member(cls, member, membername, isattr, parent):