Update README.md

Author: gcatanese

README.md

@@ -231,7 +231,7 @@ System.out.println(event.getData().getMerchantId());
 });
 ~~~~
 
-### Using Attachments in LEM(Legal Entity Management)'s Document API
+### Using Attachments in LEM (Legal Entity Management)
 When using Attachments, ensure content is provided as a byte array. It's important to convert it to a [Base64-encoded string](https://docs.adyen.com/api-explorer/legalentity/3/post/documents#request-attachments) before initiating the request.
 
 ### Proxy configuration