Update exception docblocks

src/WebsocketMessage.php

@@ -68,7 +68,7 @@ public function isBinary(): bool
     }
 
     /**
-     * @throws StreamException
+     * @throws WebsocketClosedException
      */
     public function read(?Cancellation $cancellation = null): ?string
     {
@@ -79,7 +79,7 @@ public function read(?Cancellation $cancellation = null): ?string
      * Buffer the entire message contents. Note that the given size limit may not be reached if a smaller message size
      * limit has been imposed by {@see Rfc6455Client::$messageSizeLimit}.
      *
-     * @throws BufferException|StreamException
+     * @throws WebsocketClosedException|BufferException
      * @see Payload::buffer()
      */
     public function buffer(?Cancellation $cancellation = null, int $limit = \PHP_INT_MAX): string
@@ -116,7 +116,10 @@ public function getIterator(): \Traversable
     }
 
     /**
-     * @throws BufferException|StreamException
+     * Buffers entire stream before returning. Use {@see self::buffer()} to optionally provide a {@see Cancellation}
+     * and/or length limit.
+     *
+     * @throws WebsocketClosedException|BufferException
      */
     public function __toString(): string
     {