Rephrase to add clarity.

llvm-svn: 149972

llvm/docs/ReleaseNotes.html

@@ -286,9 +286,9 @@ Release Notes</a>.</h1>
   <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 It has been replaced by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>