Fix two kernels submits in code examples

Author: TApplencourt

adoc/code/mykernel.cpp

@@ -9,10 +9,12 @@ myQueue.submit([&](handler& h) {
   h.single_task<MyKernel>([=] {
     // [kernel code]
   });
+});
 
-  // Explicitly name kernel without forward declaring type at
-  // namespace scope.  Must still be forward declarable at
-  // namespace scope, even if not declared at that scope
+// Explicitly name kernel without forward declaring type at
+// namespace scope.  Must still be forward declarable at
+// namespace scope, even if not declared at that scope
+myQueue.submit([&](handler& h) {
   h.single_task<class MyOtherKernel>([=] {
     // [kernel code]
   });