[api] Move documentation to the function it describes.

BUG=v8:5260

Review-Url: https://codereview.chromium.org/2262313002
Cr-Commit-Position: refs/heads/master@{#38826}

include/v8.h

@@ -4796,7 +4796,6 @@ class V8_EXPORT ObjectTemplate : public Template {
    * \param data A piece of data that will be passed to the callbacks
    *   whenever they are invoked.
    */
-  void SetHandler(const IndexedPropertyHandlerConfiguration& configuration);
   // TODO(dcarney): deprecate
   void SetIndexedPropertyHandler(
       IndexedPropertyGetterCallback getter,
@@ -4808,6 +4807,8 @@ class V8_EXPORT ObjectTemplate : public Template {
     SetHandler(IndexedPropertyHandlerConfiguration(getter, setter, query,
                                                    deleter, enumerator, data));
   }
+  void SetHandler(const IndexedPropertyHandlerConfiguration& configuration);
+
   /**
    * Sets the callback to be used when calling instances created from
    * this template as a function.  If no callback is set, instances