Update compiler/src/dotty/tools/dotc/staging/HealType.scala

Co-authored-by: Natsu Kagami <[email protected]>

Author: nicolasstucki

compiler/src/dotty/tools/dotc/staging/HealType.scala

@@ -66,7 +66,7 @@ class HealType(pos: SrcPos)(using Context) extends TypeMap {
   /** Try to heal reference to type `T` used in a higher level than its definition.
    *  Returns a reference to a type tag generated by `QuoteTypeTags` that contains a
    *  reference to a type alias containing the equivalent of `${summon[quoted.Type[T]]}`.
-   *  Emits and error if `T` cannot be healed and returns `T`.
+   *  Emits an error if `T` cannot be healed and returns `T`.
    */
   protected def tryHeal(sym: Symbol, tp: TypeRef, pos: SrcPos): TypeRef = {
     val reqType = defn.QuotedTypeClass.typeRef.appliedTo(tp)