Fix broken links found by "make linkcheck". scipy.org seems to be done right now, so I could not verify links going there.
diff --git a/Doc/howto/unicode.rst b/Doc/howto/unicode.rst
index 4b34c82..4e4921c 100644
--- a/Doc/howto/unicode.rst
+++ b/Doc/howto/unicode.rst
@@ -472,7 +472,7 @@
from the above output, ``'Ll'`` means 'Letter, lowercase', ``'No'`` means
"Number, other", ``'Mn'`` is "Mark, nonspacing", and ``'So'`` is "Symbol,
other". See
-<http://www.unicode.org/Public/UNIDATA/UCD.html#General_Category_Values> for a
+<http://unicode.org/Public/5.1.0/ucd/UCD.html#General_Category_Values> for a
list of category codes.
References