negspacy docs on spacy universe are out of date

[koaning]

Describe the bug
If you go to the docs here you'll see the following code example:

import spacy
from negspacy.negation import Negex

nlp = spacy.load("en_core_web_sm")
negex = Negex(nlp, ent_types=["PERSON','ORG"])
nlp.add_pipe(negex, last=True)

doc = nlp("She does not like Steve Jobs but likes Apple products.")
for e in doc.ents:
    print(e.text, e._.negex)

This is out of date and should be replaced with the contents of the current readme.

[jenojp]

Updated explosion/spaCy#8022