Fixing some problems with the adapter API

src/types.ts

@@ -107,13 +107,19 @@ export interface Message {
 }
 
 export interface Adapter {
-   init(
-      observable: ObservableInterface<Message>,
-      name?: string
-   ): void | Promise<void>;
+   /**
+    * This function initialises the Adapter. It might be called multiple times, when added to multiple instances
+    * @param observable An observable to subscribe to messages
+    */
+   init(observable: ObservableInterface<Message>): void | Promise<void>;
 
    flush(sync: true): void;
    flush(sync: false): void | Promise<void>;
 
+   /**
+    * When a close function is available, it will be called when no logging instance references it anymore.
+    *
+    * WARNING: The adapter might be reinitialised, when it is added to a new Logging instance
+    */
    close?(): void;
 }