Update docs/blog/_posts/2021-02-18-scala3-rc1.md

Co-authored-by: Dale Wijnand <[email protected]>

Author: anatoliykmetyuk

docs/blog/_posts/2021-02-18-scala3-rc1.md

@@ -76,7 +76,7 @@ Results in:
 ```scala
 1 |f(Foo)
   |  ^^^
-  |The method `apply` is inserted. The auto insertion will be deprecated, please write `rs$line$1$#Foo.apply` explicitly.
+  |The method `apply` is inserted. The auto insertion will be deprecated, please write `Foo.apply` explicitly.
 ```
 
 As the warning suggests, now you should write `Foo.apply` instead of `Foo`. See [Issue #6190](https://github.com/lampepfl/dotty/issues/6190) and [PR #7207](https://github.com/lampepfl/dotty/pull/7207) for discussion.