Small `Doc.count_by` documentation update
Current example doesn't work
@@ -500,7 +500,8 @@ cdef class Doc:
by the values of the given attribute ID.
Example:
- from spacy.en import English, attrs
+ from spacy.en import English
+ from spacy import attrs
nlp = English()
tokens = nlp(u'apple apple orange banana')
tokens.count_by(attrs.ORTH)
