Suppress docs for native CompletionHandlerException

Author: elizarov

js/kotlinx-coroutines-core-js/src/Exceptions.kt

@@ -6,8 +6,10 @@ package kotlinx.coroutines
 
 /**
  * This exception gets thrown if an exception is caught while processing [CompletionHandler] invocation for [Job].
- * @suppress
+ *
+ * @suppress **This an internal API and should not be used from general code.**
  */
+@InternalCoroutinesApi
 public actual class CompletionHandlerException public actual constructor(
     message: String,
     public override val cause: Throwable

native/kotlinx-coroutines-core-native/src/Exceptions.kt

@@ -6,7 +6,10 @@ package kotlinx.coroutines
 
 /**
  * This exception gets thrown if an exception is caught while processing [CompletionHandler] invocation for [Job].
+ *
+ * @suppress **This an internal API and should not be used from general code.**
  */
+@InternalCoroutinesApi
 public actual class CompletionHandlerException public actual constructor(
     message: String,
     public override val cause: Throwable