[Documentation]: using children as an arg section missing completely from docs

[tbredin]

Describe the problem

https://storybook.js.org/docs/writing-stories/stories-for-multiple-components#using-children-as-an-arg

This section still shows up in google, and the sidebar menu item still exists, but it links nowhere and there appears to be a missing section in the docs on this page, and elsewhere seems not to be any documentation about using the children arg on the site anymore. As a result, I must be using it wrong because it just throws errors for me, and I can't work out how to get it to work or how its intended to be used.

1. If this feature was removed in v8 or something like this, perhaps a depreciation message would be suitable in the docs so that we don't chase a no longer supported feature, and providing an alternative encouraged approach would be appreciated
2. If it is still supported then we need some documentation

Thanks!

Additional context

No response