add to docs

Author: kevinjqliu

mkdocs/docs/configuration.md

@@ -161,6 +161,7 @@ For the FileIO there are several configuration options available:
 | adls.dfs-storage-authority   | .dfs.core.windows.net                                                                       | The hostname[:port] of the Data Lake Gen 2 Service. Defaults to `.dfs.core.windows.net`. Useful for connecting to a local emulator, like [azurite](https://github.com/azure/azurite). See [AzureFileSystem](https://arrow.apache.org/docs/python/filesystems.html#azure-storage-file-system) for reference                |
 | adls.blob-storage-scheme     | https                                                                                       | Either `http` or `https`. Defaults to `https`. Useful for connecting to a local emulator, like [azurite](https://github.com/azure/azurite). See [AzureFileSystem](https://arrow.apache.org/docs/python/filesystems.html#azure-storage-file-system) for reference                                                      |
 | adls.dfs-storage-scheme      | https                                                                                       | Either `http` or `https`. Defaults to `https`. Useful for connecting to a local emulator, like [azurite](https://github.com/azure/azurite). See [AzureFileSystem](https://arrow.apache.org/docs/python/filesystems.html#azure-storage-file-system) for reference                                                          |
+| adls.token                   | eyJ0eXAiOiJKV1QiLCJhbGci...                                                                 | Static access token for authenticating with ADLS. Used for OAuth2 flows.                                                                                                                                                                       |
 
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