[Doc]: AzureBlobFileSystem(credential)

[davidkhala]

Hi maintainers, I am new to adlfs community and get confused immediate on pydoc below

class AzureBlobFileSystem(AsyncFileSystem):
...
    credential: azure.core.credentials_async.AsyncTokenCredential or SAS token
        The credentials with which to authenticate.  Optional if the account URL already has a SAS token.
        Can include an instance of TokenCredential class from azure.identity.aio.

but in the function signature of init, I see type hint of credential is str. What should it actually accept?