Update script usage

package.json

@@ -25,6 +25,6 @@
     "gql": "yarn graphql-codegen && yarn tsc -p studio/tsconfig.json",
     "dev": "node bin/index.js",
     "dev:example": "yarn dev --supergraph example/supergraph.graphql --operation example/operation.graphql",
-    "dev:example:pretty": "yarn dev --supergraph example/supergraph.graphql --operation example/operation.graphql --pretty"
+    "dev:example:pretty": "yarn dev:example --pretty"
   }
 }