Fix broken link in decimal documentation.
diff --git a/Doc/library/decimal.rst b/Doc/library/decimal.rst
index 3495241..89857f0 100644
--- a/Doc/library/decimal.rst
+++ b/Doc/library/decimal.rst
@@ -91,7 +91,7 @@
Specification <http://www2.hursley.ibm.com/decimal/decarith.html>`_.
* IEEE standard 854-1987, `Unofficial IEEE 854 Text
- <http://www.cs.berkeley.edu/~ejr/projects/754/private/drafts/854-1987/dir.html>`_.
+ <http://754r.ucbtest.org/standards/854.pdf>`_.
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