docs: change name

en/manual/engine/index.md

@@ -4,7 +4,7 @@
 >This section is out of date. For now, you should only use it for reference.
 
 - [Asset](assets/index.md)
-- [Entity-component model](entity-component-system/index.md)
+- [Entity-component system](entity-component-system/index.md)
 - [File system](file-system.md)
 
 # See also