docs(nuxt): add missing comma (#12363)

There should be a comma between object properties.

Author: dargmuesli

docs/platforms/javascript/guides/nuxt/features/component-tracking.mdx

@@ -60,7 +60,7 @@ Sentry.init({
   integrations: [
     Sentry.vueIntegration({
       tracingOptions: {
-        trackComponents: true
+        trackComponents: true,
         hooks: ["mount", "update", "unmount"],
       },
     }),