Fix issue #4676

Fixed spelling mistake at EmbeddedChannel#readOutbound()

transport/src/main/java/io/netty/channel/embedded/EmbeddedChannel.java

@@ -153,7 +153,7 @@ public Object readInbound() {
     }
 
     /**
-     * Read data froum the outbound. This may return {@code null} if nothing is readable.
+     * Read data from the outbound. This may return {@code null} if nothing is readable.
      */
     public Object readOutbound() {
         return poll(outboundMessages);