[Documentation]: `linkable` key has been deprecated

[oruebel]

What would you like changed or added to the documentation and why?

https://github.com/hdmf-dev/hdmf-schema-language/pull/27 deprecated the linkable key. hdmf-zarr does not support this key right now either. I would suggest removing it from the docs (and also check if it appears anywhere in the code)

https://github.com/hdmf-dev/hdmf-zarr/blob/6e946dabc2370bb428787fbe7d1ec919ba1fd11f/docs/source/storage.rst?plain=1#L92

https://github.com/hdmf-dev/hdmf-zarr/blob/6e946dabc2370bb428787fbe7d1ec919ba1fd11f/docs/source/storage.rst?plain=1#L58

Do you have any interest in helping write or edit the documentation?

No.

Code of Conduct

• [X] I agree to follow this project's Code of Conduct
• [X] Have you checked the Contributing document?
• [X] Have you ensured this change was not already requested?

[oruebel]

I think this is probably just a simple 2-line update in the docs.

[mavaylon1]

Can do