Correct Events and Event Handling overview

Change "order" to "reverse order" in "... dynamically bound handlers
are searched in order of their registration ...".

Use better check for C++11 in a code example.

Unify whitespace usage in code examples.

docs/doxygen/overviews/eventhandling.h

@@ -389,7 +389,7 @@ Another common example of a generic functor is boost::function<> or, since
 C++11, std::function<>:
 
 @code
-#if __cplusplus >= 201103L || wxCHECK_VISUALC_VERSION(10)
+#if wxCHECK_CXX_STD(201103L)
 using namespace std;
 using namespace std::placeholders;
 #else // Pre C++11 compiler
@@ -477,7 +477,7 @@ doesn't count as having handled the event and the search continues):
     checking the static event table entries, so if both a dynamic and a static
     event handler match the same event, the static one is never going to be
     used unless wxEvent::Skip() is called in the dynamic one. Also note that
-    the dynamically bound handlers are searched in order of their registration
+    the dynamically bound handlers are searched in reverse order of their registration
     during program run-time, i.e. later bound handlers take priority over the
     previously bound ones.
     </li>