docs: [CMake] Add Xcode to the list of project formats CMake can generate.

Suggested by Sean McBride, thanks!

llvm-svn: 168745
diff --git a/clang/www/get_started.html b/clang/www/get_started.html
index 86b5e17..8b558d1 100644
--- a/clang/www/get_started.html
+++ b/clang/www/get_started.html
@@ -85,7 +85,7 @@
     <li>Note: For subsequent Clang development, you can just do make at the
     clang directory level.</li>
     <li>It is also possible to use CMake instead of the makefiles. With CMake
-    it is also possible to generate project files for several IDEs: Eclipse
+    it is possible to generate project files for several IDEs: Xcode, Eclipse
     CDT4, CodeBlocks, Qt-Creator (use the CodeBlocks generator), KDevelop3.</li>
   </ul>
   </li>