correct error message for NEXT_PUBLIC_ROLLUP_L2_WITHDRAWAL_URL

deploy/tools/envs-validator/schema.ts

@@ -257,7 +257,7 @@ const rollupSchema = yup
       .when('NEXT_PUBLIC_ROLLUP_TYPE', {
         is: (value: string) => value === 'optimistic',
         then: (schema) => schema.test(urlTest).required(),
-        otherwise: (schema) => schema.max(-1, 'NEXT_PUBLIC_ROLLUP_L2_WITHDRAWAL_URL cannot not be used if NEXT_PUBLIC_ROLLUP_TYPE is not defined'),
+        otherwise: (schema) => schema.max(-1, 'NEXT_PUBLIC_ROLLUP_L2_WITHDRAWAL_URL can be used only if NEXT_PUBLIC_ROLLUP_TYPE is set to \'optimistic\' '),
       }),
   });