Fix example code

Author: bevilacqc

docs/user-guide/storage.rst

@@ -89,9 +89,11 @@ API. ``storage_options`` can be used to configure the fsspec backend.:
 
 The type of filesystem (e.g. S3, https, etc..) is inferred from the scheme of the url (e.g. s3 for "**s3**://noaa-nwm-retro-v2-zarr-pds").
 In case a specific filesystem is needed, one can explicitly create it. For example to create a S3 filesystem:
+   
+   >>> import fsspec
    >>> fs = fsspec.filesystem(
    ...    's3', anon=True, asynchronous=True,
-   ...    client_kwargs={'endpoint_url': "https://s3.example-site.org"}
+   ...    client_kwargs={'endpoint_url': "https://noaa-nwm-retro-v2-zarr-pds.s3.amazonaws.com"}
    ... )
    >>> store = zarr.storage.FsspecStore(fs)