Merge pull request #13311 from dotty-staging/stabilize-scala.annotation.internal.ErasedParam

Stabilize `Quotes.refelct.TermParamClause.isErased`

Author: anatoliykmetyuk

library/src/scala/annotation/internal/ErasedParam.scala

@@ -2,5 +2,4 @@ package scala.annotation
 package internal
 
 /** An annotation produced by Namer to indicate an erased parameter */
-@experimental
 final class ErasedParam() extends Annotation

library/src/scala/quoted/Quotes.scala

@@ -2199,7 +2199,6 @@ trait Quotes { self: runtime.QuoteUnpickler & runtime.QuoteMatching =>
         /** Is this a given parameter clause `(using X1, ..., Xn)` or `(using x1: X1, ..., xn: Xn)` */
         def isGiven: Boolean
         /** Is this a erased parameter clause `(erased x1: X1, ..., xn: Xn)` */
-        @experimental
         def isErased: Boolean
     end TermParamClauseMethods