docs: update integration docs for openai embeddings (langchain-ai#25249)

Related issue: langchain-ai#24856

```json
   {
      "provider": "openai",
      "js":  true,
      "local": false,
     "serializable": false,
"async_native": true
  }
```

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Co-authored-by: Isaac Francisco <[email protected]>
Co-authored-by: isaac hershenson <[email protected]>