Doc: Some papercuts in Help documents
Select <gui style="tab">Quality</gui>.
There are no more Quality tab.
- https://gitlab.gnome.org/GNOME/simple-scan/-/blob/master/help/C/brightness-contrast.page#L32
- https://gitlab.gnome.org/GNOME/simple-scan/-/blob/master/help/C/dpi.page#L32
200 dpi missing in dpi.page
https://gitlab.gnome.org/GNOME/simple-scan/-/blob/master/help/C/dpi.page#L58-60
Quality page is not explaining anything about Brightness, Contrast, Compression and Postprocessing.
https://gitlab.gnome.org/GNOME/simple-scan/-/blob/master/help/C/quality.page