tokenizer doc fix
@@ -348,7 +348,7 @@ cdef class Tokenizer:
"""Add a special-case tokenization rule.
string (unicode): The string to specially tokenize.
- token_attrs (iterable): A sequence of dicts, where each dict describes
+ substrings (iterable): A sequence of dicts, where each dict describes
a token and its attributes. The `ORTH` fields of the attributes
must exactly match the string when they are concatenated.
