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

@@ -86,7 +86,7 @@ Although opaque types are supposed to provide an opaque abstraction of their und
 ```scala
 val imm = IArray(1,2,3) // supposedly immutable...
 imm match
-   case a: Array[Int] => a(0) = 0  // but that's shown to be lie
+  case a: Array[Int] => a(0) = 0  // but that's shown to be lie
 ```
 
 To address this change, a new trait, `Matchable`, is introduced at the top of the type hierarchy: