Add RCT2 address comments

[ci skip]

src/openrct2/interface/viewport.c

@@ -250,6 +250,9 @@ void viewport_adjust_for_map_height(sint16* x, sint16* y, sint16 *z)
 	*z = height;
 }
 
+/*
+*  rct2: 0x006E7FF3
+*/
 static void viewport_redraw_after_shift(rct_drawpixelinfo *dpi, rct_window *window, rct_viewport *viewport, sint32 x, sint32 y)
 {
 	// sub-divide by intersecting windows

src/openrct2/peep/peep.c

@@ -1392,6 +1392,10 @@ static uint8 peep_get_action_sprite_type(rct_peep* peep)
 	}
 }
 
+
+/*
+*  rct2: 0x00693B58
+*/
 void peep_update_current_action_sprite_type(rct_peep* peep){
 	if (peep->sprite_type >= countof(g_peep_animation_entries)) {
 		return;

src/openrct2/ride/ride.c

@@ -1400,6 +1400,9 @@ void ride_construction_remove_ghosts()
 	}
 }
 
+/*
+*  rct2: 0x006C9627
+*/
 void ride_construction_invalidate_current_track()
 {
 	sint32 x, y, z;