Mark ObjectRef::get_entity_name() deprecated

data/mods/default/init.lua

@@ -210,7 +210,7 @@
 -- -           select_horiz_by_yawpitch=false)
 -- - ^ Select sprite from spritesheet with optional animation and DM-style
 -- -   texture selection based on yaw relative to camera
--- - get_entity_name()
+-- - get_entity_name() (DEPRECATED: Will be removed in a future version)
 -- - get_luaentity()
 -- Player-only: (no-op for other objects)
 -- - get_player_name(): will return nil if is not a player

src/scriptapi.cpp

@@ -2026,6 +2026,7 @@ private:
 		return 0;
 	}
 
+	// DEPRECATED
 	// get_entity_name(self)
 	static int l_get_entity_name(lua_State *L)
 	{