feat: describe task type disabling

[janepie]

☑️ Resolves

add documentation for changes in nextcloud/server#49727

🖼️ Screenshots

[oleksandr-nc]

It's nice when what has changed is highlighted in red,- great PR!

[welcome]

Thanks for your first pull request and welcome to the community! Feel free to keep them coming! If you are looking for issues to tackle then have a look at this selection: https://github.com/nextcloud/documentation/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

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