Appends a line separator to this Appendable.
fun Appendable.appendln(): Appendable
Appends value to the given Appendable and line separator after it.
fun Appendable.appendln(value: CharSequence?): Appendable
fun Appendable.appendln(value: Char): Appendable
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/java.lang.-appendable/index.html