Be more explicit about experimental status (#5800)

docs/source/advanced/nullability.mdx

@@ -3,7 +3,7 @@ title: Handling nullability and errors
 description: Make your queries even more typesafe
 ---
 
-> ⚠️ **Nullability annotations are not part of the specification and are subject to change.** If you have feedback on them, please let us know via [GitHub issues](https://github.com/apollographql/apollo-kotlin/issues/new?assignees=&labels=Type%3A+Bug&template=bug_report.md&title=[Data%20Builders]), in the [Kotlin Slack community](https://slack.kotl.in/), or in the [GraphQL nullability working group](https://github.com/graphql/nullability-wg/). 
+> ⚠️ **Nullability annotations are currently [experimental](https://www.apollographql.com/docs/resources/release-stages/#experimental-features) in Apollo Kotlin.** If you have feedback on them, please let us know via [GitHub issues](https://github.com/apollographql/apollo-kotlin/issues/new?assignees=&labels=Type%3A+Bug&template=bug_report.md&title=[Defer%20Support]), in the [Kotlin Slack community](https://slack.kotl.in/), or in the [GraphQL nullability working group](https://github.com/graphql/nullability-wg/).
 
 ## Nullability in GraphQL
 

docs/source/config.json

@@ -71,7 +71,7 @@
     },
     "Advanced": {
       "Uploading files": "/advanced/upload",
-      "Handling nullability": "/advanced/nullability",
+      "Handling nullability (experimental)": "/advanced/nullability",
       "Using aliases": "/advanced/using-aliases",
       "Using with Java": "/advanced/java",
       "Kotlin native": "/advanced/kotlin-native",