Use -opt-in instead of -Xopt-in in comments and scripts

libraries/stdlib/common/src/kotlin/JsAnnotationsH.kt

@@ -21,7 +21,7 @@ public expect annotation class JsName(val name: String)
  *
  * Usages of such annotations will be reported as warnings unless an explicit opt-in with
  * the [OptIn] annotation, e.g. `@OptIn(ExperimentalJsExport::class)`,
- * or with the `-Xopt-in=kotlin.js.ExperimentalJsExport` compiler option is given.
+ * or with the `-opt-in=kotlin.js.ExperimentalJsExport` compiler option is given.
  */
 @Suppress("DEPRECATION")
 @Experimental(level = Experimental.Level.WARNING)