The LMDE download page refers to the documentation as the "Installation Guide".
There are two possibilities:
- the download page shouldn't refer to the doc,
- the doc should refer to LMDE (but it seems that it shouldn't (see this post)…?)
This issue is related to the second option.
I spotted so far only 2 things to modify in this case:
- refer explicitly to LMDE,
- indicate there is no "install alongside Windows" option in the LMDE installer.
P.S.: I also did something about the first option, see this issue.