doc: don't use deprecated functionality.

Thanks, Clang integrated into KDevelop!

doc/generated/hello.cpp

@@ -43,8 +43,8 @@ private:
 
 Hello::Hello(const Arguments& arguments): Platform::Application(arguments) {
     Renderer::setClearColor(Color3::fromHSV(216.0_degf, 0.85f, 1.0f));
-    Debug() << "Hello! This application is running on" << Context::current()->version()
-            << "using" << Context::current()->rendererString();
+    Debug() << "Hello! This application is running on" << Context::current().version()
+            << "using" << Context::current().rendererString();
 }
 
 void Hello::drawEvent() {