Update src/api/composition-api.md

Co-authored-by: Phan An <me@phanan.net>

Author: NataliaTepluhina

src/api/composition-api.md

@@ -1053,7 +1053,7 @@ console.log(isReactive(bar.foo)) // false
 ```
 
 ::: warning
-`markRaw` and the shallowXXX APIs below allow you to selectively opt-out of the default deep reactive / readonly conversion and embed raw, non-proxied objects in your state graph. They can be used for various reasons:
+`markRaw` and the shallowXXX APIs below allow you to selectively opt-out of the default deep reactive/readonly conversion and embed raw, non-proxied objects in your state graph. They can be used for various reasons:
 
 - Some values simply should not be made reactive, for example a complex 3rd party class instance, or a Vue component object.