Change docs

Author: rruuaanng

Doc/library/xml.etree.elementtree.rst

@@ -665,10 +665,10 @@ Functions
    not given, the standard :class:`XMLParser` parser is used.  Returns an
    :class:`ElementTree` instance.
 
-   .. warning::
+   .. note::
 
-      When the *source* encoding is ``ISO-8859-1`` and the mode is ``r``, An encoding
-      error warning will be thrown.
+      When the *source* encoding is ``ISO-8859-1`` and the mode is ``r``,
+      a warning is emited.
 
 
 .. function:: ProcessingInstruction(target, text=None)