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
  }
```

---------

Co-authored-by: Isaac Francisco <78627776+isahers1@users.noreply.github.com>
Co-authored-by: isaac hershenson <ihershenson@hmc.edu>

Author: 2 people