docs: nightly release dependency package name (#750)

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docs/content/1.getting-started/1.setup.md

@@ -50,7 +50,7 @@ To use the nightly version, follow these steps:
   ```json
   {
     "devDependencies": {
-      "nuxt": "npm:@nuxtjs/storybook@nightly"
+      "@nuxtjs/storybook": "npm:@nuxtjs/storybook@nightly"
     }
   }
   ```