Merge pull request scala/scala#9783 from lrytz/formatted

Deprecate anyVal.formatted(formatString)

Author: lrytz

library/src/scala/Predef.scala

@@ -327,6 +327,7 @@ object Predef extends LowPriorityImplicits with DeprecatedPredef {
      *  Format strings are as for `String.format`
      *  (@see java.lang.String.format).
      */
+    @deprecated("Use `formatString.format(value)` instead of `value.formatted(formatString)`,\nor use the `f\"\"` string interpolator. In Java 15 and later, `formatted` resolves to the new method in String which has reversed parameters.", "2.12.16")
     @inline def formatted(fmtstr: String): String = fmtstr format self
   }