Update docs/blog/_posts/2020-12-18-scala3-m3.md

Co-authored-by: Sébastien Doeraene <[email protected]>

Author: anatoliykmetyuk

docs/blog/_posts/2020-12-18-scala3-m3.md

@@ -62,7 +62,7 @@ Since we dropped `as` from `given`s, we lost a strong reason for having `as` at
 case opt as Some(foo)
 ```
 
-Now it got reverted to the Scala 2 style:
+Instead, code that used it should be reverted to use the existing syntax of Scala 2, using `@`:
 
 ```scala
 case opt @ Some(foo)