Add some LLDB release notes for 3.2 (with Linux improvements that made it in)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_32@170247 91177308-0d34-0410-b5e6-96231b3b80d8

docs/ReleaseNotes.html

@@ -175,7 +175,9 @@
 <p>The 3.2 release has the following notable changes:</p>
 
 <ul>
-  <li>...</li>
+  <li>Linux build fixes for clang (see <a href="http://lldb.llvm.org/build.html">Building LLDB</a>)</li>
+  <li>Some Linux stablity and usability improvements</li>
+  <li>Switch expression evaluation to use MCJIT (from legacy JIT) on Linux</li>
 </ul>
 
 </div>