Document delete api documentation is misleading/incorrect

[azillion]

mongoengine/mongoengine/document.py

Line 587 in 2121387

``save(..., write_concern={w: 2, fsync: True}, ...)`` will

The example shows write_concern as a keyword argument but actually requires:
document.delete(w=2, fsync=True)

[bagerard]

Good catch!

[bagerard]

Argh, sorry I forgot to mark the PR with "Fixes" so tiket wasn't closed automatically. I believe it can be closed