Fix the description of Element.keys() and Element.items()

They do not return a list in the Python implementation, which returns dict
views.  And the attributes are no longer returned in an arbitrary order:
the attrib dict preserves the insertion order.

Author: serhiy-storchaka

Doc/library/xml.etree.elementtree.rst

@@ -956,14 +956,12 @@ Element Objects
 
    .. method:: items()
 
-      Returns the element attributes as a sequence of (name, value) pairs.  The
-      attributes are returned in an arbitrary order.
+      Returns the element attributes as (name, value) pairs.
 
 
    .. method:: keys()
 
-      Returns the elements attribute names as a list.  The names are returned
-      in an arbitrary order.
+      Returns the element attribute names.
 
 
    .. method:: set(key, value)

Lib/xml/etree/ElementTree.py

@@ -356,21 +356,17 @@ def set(self, key, value):
         self.attrib[key] = value
 
     def keys(self):
-        """Get list of attribute names.
+        """Get attribute names.
 
-        Names are returned in an arbitrary order, just like an ordinary
-        Python dict.  Equivalent to attrib.keys()
+        Equivalent to attrib.keys()
 
         """
         return self.attrib.keys()
 
     def items(self):
-        """Get element attributes as a sequence.
+        """Get element attributes as (name, value) pairs.
 
-        The attributes are returned in arbitrary order.  Equivalent to
-        attrib.items().
-
-        Return a list of (name, value) tuples.
+        Equivalent to attrib.items().
 
         """
         return self.attrib.items()