Remove confusing example of is_ready, issue #24

Author: arturl

N4123_future.html

@@ -302,17 +302,6 @@ <h1> <del>Changes to c</del><ins>C</ins>lass template <code>future</code></h1>
 <cxx-function>
   <cxx-signature>bool is_ready() const;</cxx-signature>
   <cxx-Returns> <code>true</code> if the shared state is ready, <code>false</code> if it isn't.</cxx-Returns>
-  <cxx-remarks><ins>The function returns <code>false</code> if the shared state has been invalidated
-  (for example, by <code>get()</code> or <code>wait()</code>).</ins></cxx-remarks>
-  <cxx-example>
-  <pre><ins>void g(futue&lt;int> f) {
-    if (f.is_ready()) {
-        f.get();
-        assert(!f.is_ready());
-    }
-}
-</ins></pre>
-  </cxx-example>
 </cxx-function>
 
 </cxx-section>