Update forms.md (#141)

_docs/floodgate/forms.md

@@ -91,8 +91,8 @@ FloodgatePlayer player = FloodgateApi.getInstance().getPlayer(uuid);
 player.sendForm(
     CustomForm.builder()
         .title("My cool title")
-        .content("10/10 content")
-));
+        .label("10/10 content")
+);
 ```
 
 ## Receiving a response from the client