Update docs/source/dataaccess.md

Co-authored-by: Norman Fomferra <[email protected]>

Author: TonioF

docs/source/dataaccess.md

@@ -798,7 +798,7 @@ def init_plugin(ext_registry: extension.ExtensionRegistry):
             '{your_package}.opener:{YourOpenerClass}'),
         point=EXTENSION_POINT_DATA_OPENERS, 
         name="{your_opener_id}",
-        description='{your opener description}',
-        extensions=['Optional', 'list', 'of', 'file', 'extensions'],
+        description="{your opener description}",
+        filename_extensions=[".j2k", ".zarr"],  # adjust or leave empty
     )
 ```