Add comments to states.

source/appstates/TitleSelectCommon.cpp

@@ -4,13 +4,19 @@
 #include "sdl.hpp"
 #include "strings/strings.hpp"
 
+//                      ---- Construction ----
+
 TitleSelectCommon::TitleSelectCommon() { TitleSelectCommon::initialize_control_guide(); }
 
+//                      ---- Public functions ----
+
 void TitleSelectCommon::sub_update() { sm_controlGuide->sub_update(); }
 
+//                      ---- Private functions ----
+
 void TitleSelectCommon::initialize_control_guide()
 {
     if (sm_controlGuide) { return; }
 
     sm_controlGuide = ui::ControlGuide::create(strings::get_by_name(strings::names::CONTROL_GUIDES, 1));
-}
+}