fix some reference to Unicode 8 that should be to Unicode 9 (#2346)

Doc/library/stdtypes.rst

@@ -354,7 +354,7 @@ Notes:
    The numeric literals accepted include the digits ``0`` to ``9`` or any
    Unicode equivalent (code points with the ``Nd`` property).
 
-   See http://www.unicode.org/Public/8.0.0/ucd/extracted/DerivedNumericType.txt
+   See http://www.unicode.org/Public/9.0.0/ucd/extracted/DerivedNumericType.txt
    for a complete list of code points with the ``Nd`` property.
 
 

Doc/reference/lexical_analysis.rst

@@ -313,7 +313,7 @@ The Unicode category codes mentioned above stand for:
 * *Nd* - decimal numbers
 * *Pc* - connector punctuations
 * *Other_ID_Start* - explicit list of characters in `PropList.txt
-  <http://www.unicode.org/Public/8.0.0/ucd/PropList.txt>`_ to support backwards
+  <http://www.unicode.org/Public/9.0.0/ucd/PropList.txt>`_ to support backwards
   compatibility
 * *Other_ID_Continue* - likewise
 
@@ -875,4 +875,4 @@ occurrence outside string literals and comments is an unconditional error:
 
 .. rubric:: Footnotes
 
-.. [#] http://www.unicode.org/Public/8.0.0/ucd/NameAliases.txt
+.. [#] http://www.unicode.org/Public/9.0.0/ucd/NameAliases.txt