Fix broken link in html.entities docs.
diff --git a/Doc/library/html.entities.rst b/Doc/library/html.entities.rst
index 65ce817..0aabbad 100644
--- a/Doc/library/html.entities.rst
+++ b/Doc/library/html.entities.rst
@@ -42,4 +42,4 @@
 
 .. rubric:: Footnotes
 
-.. [#] See http://www.w3.org/TR/html5/named-character-references.html
+.. [#] See http://www.w3.org/TR/html5/syntax.html#named-character-references