Rephrase to add clarity.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149972 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index 71b7148..6d08b4e 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -286,9 +286,9 @@
   <ul>
     <li>IR support for half float</li>
     <li>IR support for vectors of pointers, including vector GEPs.</li>
-    <li>The <tt>unwind</tt> instruction is now gone. It has been replaced by
-        the <tt>landingpad</tt>/<tt>resume</tt> exception handling
-        mechanisms.</li>
+    <li>The <tt>unwind</tt> instruction is now gone. With the introduction of
+        the new exception handling system in LLVM 3.0, the <tt>unwind</tt>
+        instruction became obsolete.</li>
     <li>....</li>
   </ul>
 </div>