[Documentation] Wrong description of the scrollableParentEl for the virtual lists.

[ievgennaida]

Documentation is mentioning property scrollableParentEl to accept HTMLElement but passing element does not work while code of virtual list is clearly expecting array.

Possible doc update:

1. Array is expected, getElementsByClassName does not work because it's not properly taken by dom svelte helper (version 8.3.3).
2. String is also not explicitly mentioned that it;s css selector, not just id or class name.

https://framework7.io/docs/virtual-list#param-scrollableParentEl scrollableParentEl

See scrollableParentEl HTMLElement , string