docs: log error on failing to convert form to ServerFn type, in addit…

…ion to setting action value (#2319)

router/src/components/form.rs

@@ -478,6 +478,10 @@ where
                     action.dispatch(new_input);
                 }
                 Err(err) => {
+                    error!(
+                        "Error converting form field into server function \
+                         arguments: {err:?}"
+                    );
                     batch(move || {
                         value.set(Some(Err(ServerFnError::Serialization(
                             err.to_string(),