chore: small polishings to example

- Add note in readme that order will need to be encoded still
- Fix log
- Don't pass executors to builder

examples/uniswapx-encoding-example/README.md

@@ -5,6 +5,9 @@ This guide enables you to:
 1. Create a Solution object
 2. Create callback data for executing a UniswapX Order
 
+Note: This guide only encodes the callback data for you. You will still have to encode the call to the
+`execute` method of the filler, which also includes the encoded UniswapX order.
+
 ## How to run
 
 ```bash