Drop the "with after classes" paragraph

Author: anatoliykmetyuk

docs/blog/_posts/2021-02-17-scala3-rc1.md

@@ -81,14 +81,6 @@ This way expresses the intent of the idiom in a more verbose and easy to read wa
 
 For discussion, see [PR #11231](https://github.com/lampepfl/dotty/pull/11231), and the [documentation](https://dotty.epfl.ch/docs/reference/dropped-features/wildcard-init.html) is available on our website.
 
-# Allow `with` after class
-[PR #11157](https://github.com/lampepfl/dotty/pull/11157) brings an syntactic change whereby you have to write `with` instead of `:` to signify the start of the body of a class definition. For example:
-
-```scala
-object Foo with  // Was previously `object Foo:`
-  val x = 10
-```
-
 # Eta-expand companion object if functions are expected
 Starting from RC1, we no longer generate a function parent for companions of case classes. Which means, for example, that given `case class Foo(x: Int)`, you won't be able to use `Foo` in a position where a function is expected: