Implement ApolloWebSocketClosedException on darwin targets and update docs

[martinbonnin]

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[svc-apollo-docs]

✅ Docs Preview Ready

Configuration

{
  "repoOverrides": {
    "apollographql/apollo-kotlin@main": {
      "remote": {
        "owner": "apollographql",
        "repo": "apollo-kotlin",
        "branch": "websocket-header"
      }
    }
  }
}

Name	Link
Commit	d08c5f7
Preview	https://www.apollographql.com/docs/deploy-preview/7349813fee2e265677a6
Build ID	7349813fee2e265677a6
File Changes	0 new, 1 changed, 0 removed * (developer-tools)/kotlin/(latest)/advanced/experimental-websockets.mdx
Pages	1

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1 pages published. Build will be available for 30 days.

[BoD]

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