Update @JvmDefault documentation

libraries/stdlib/jvm/src/kotlin/jvm/JvmDefault.kt

@@ -11,10 +11,21 @@ import kotlin.internal.RequireKotlinVersionKind
 /**
  * Specifies that a JVM default method should be generated for non-abstract Kotlin interface member.
  *
- * This annotation requires explicit compilation flag to be enabled: `-Xenable-jvm-default`.
+ * Usages of this annotation require an explicit compilation argument to be specified:
- * Also this requires jvmTarget 1.8 or higher.
+ * either `-Xjvm-default=enable` or `-Xjvm-default=compatibility`.
- * Adding or removing this annotation to an interface member is a binary incompatible change.
+ *
- * @JvmDefault methods are excluded from interface delegation.
+ * * with `-Xjvm-default=enable`, only default method in interface is generated for each @[JvmDefault] method.
+ *   In this mode, annotating an existing method with @[JvmDefault] can break binary compatibility, because it will effectively
+ *   remove the method from the `DefaultImpls` class.
+ * * with `-Xjvm-default=compatibility`, in addition to the default interface method, a compatibility accessor is generated
+ *   in the `DefaultImpls` class, that calls the default interface method via a synthetic accessor.
+ *   In this mode, annotating an existing method with @[JvmDefault] is binary compatible, but results in more methods in bytecode.
+ *
+ * Removing this annotation from an interface member is a binary incompatible change in both modes.
+ *
+ * Generation of default methods is only possible with JVM target bytecode version 1.8 (`-jvm-target 1.8`) or higher.
+ *
+ * @[JvmDefault] methods are excluded from interface delegation.
  */
 @SinceKotlin("1.2")
 @RequireKotlin("1.2.40", versionKind = RequireKotlinVersionKind.COMPILER_VERSION)