docs/UsersManual.html: Remove obsolete mingw issue.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@144897 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/UsersManual.html b/docs/UsersManual.html
index ac19e15..efeb091 100644
--- a/docs/UsersManual.html
+++ b/docs/UsersManual.html
@@ -1066,7 +1066,7 @@
 <li><tt>C:/mingw/lib/gcc/mingw32/4.[3-5].0/include/c++</tt></li>
 </ul>
 
-<p>On MSYS, a few tests might fail. It is due to <a href="http://llvm.org/bugs/show_bug.cgi?id=8520">Bug 8520</a> and is fixed in <a href="http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20110314/118106.html">LLVM's r127724</a>.</p>
+<p>On MSYS, a few tests might fail.</p>
 
 <h5>MinGW-w64</h5>