Whether this document can already be intended for translation 
Shouldn’t this info be placed on the Part_EditAttachment page instead?
The site you are writing about is already very long.
There is a link in its content.
from my point of view, we can add to what Roy is pointing.
https://wiki.freecad.org/Part_EditAttachment is long but easy to ready.
In some documents we have a section to expand
maybe it is worth to add this content from a separate document in such a way
There is a good reason to keep these things on a single page: People don’t go there to find out what e.g. mode O-X-Y does, but rather because they need a certain attachment and try to find something suitable. We may need a separate overview page, which shows how to select a certain attachment mode.
yes expand, good option.