more docs

src/commonMain/kotlin/net.sergeych.parsec3/Adapter.kt

@@ -81,6 +81,10 @@ open class Adapter<T: WithAdapter>(
     /**
      * If you plaan to cancel the adapter from outside its context (e.g. from API command or like)
      * provide specific close code that frees resource for this adapter (like closing websocket connection).
+     *
+     * Typically this method should be set by the transport when connection is established. It is, still, an option,
+     * as not any adapter/trasport combination requires it. Default websock transport implements it
+     * out of the box.
      */
     var onCancel: suspend ()->Unit = { throw NotImplementedError("this adapted has no onCancel implementation, provide it")}
 
@@ -195,8 +199,13 @@ open class Adapter<T: WithAdapter>(
     class CloseError : IOException("adapter is closed")
 
     /**
-     * Frees any allocater resources, for example, pending commands.
+     * Frees any allocated resources, for example, pending commands.
-     * Any protocol implementatino MUST call it when connection is closed.
+     * Any protocol implementation MUST call it when connection is closed.
+     * Note that penging commands are completed exceptionally woth [CloseError].
+     *
+     * Normally, end user does not call it. Instead, it should call [cancel] if adapter needs
+     * to be explicitedly cancelled. Instead, [Parsec3Transport] inplementations _must_ call `close()`
+     * on the adapter instance it create when the connection is closed.
      */
     fun close() {
         val error = CloseError()