[R][Documentation] Document add_filename on open_dataset help page
Open
Component: Documentation
Component: R
Status: needs champion
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
In https://github.com/apache/arrow/issues/38724, it was pointed out that `add_filename` could be easier to find. Documenting it on the open_dataset help page would be a good start and maybe whoever does that might find other places it could be documented better too.
### Component(s)
Documentation, R
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