Add ref-qualified member functions as undiscussed in the C++11 guide.

styleguide/c++/c++11.html

Index: styleguide/c++/c++11.html
diff --git a/styleguide/c++/c++11.html b/styleguide/c++/c++11.html
index ed917712055c952f72e72e15b9530463eedf64d6..cb572957b480aa55d45a2f1cf9cfdbd9c2d3026e 100644
--- a/styleguide/c++/c++11.html
+++ b/styleguide/c++/c++11.html
@@ -459,6 +459,15 @@ std::exception</a></td>
 </tr>
 
 <tr>
+<td>Ref-qualified Member Functions</td>
+<td><code>class T {<br/>&nbsp;&nbsp;void f() & {}<br/>&nbsp;&nbsp;void f() && {}<br/>};<br/>t.f();  // first<br/>T().f(); // second<br/>std::move(t).f(); // second</code></td>
+<td>Allows class member functions to only bind to |this| as an rvalue or lvalue.</td>
+<td><a href="http://en.cppreference.com/w/cpp/language/member_functions">
+Member functions</a></td>
+<td>Banned in the google3 C++11 library style guide, but being considered for use in bind/callback in google3 and the standard library.</td>
+</tr>
+
+<tr>
 <td>Union Class Members</td>
 <td><code>union <i>name</i> { <i>class</i> <i>var</i>}</code></td>
 <td>Allows class type members</td>