Improve docs of attr.s(match_args=True) (#919)

* Improve docs of `attr.s(match_args=True)`

* Update src/attr/_make.py

Co-authored-by: Hynek Schlawack <hs@ox.cx>

Author: sobolevn

src/attr/_make.py

@@ -1458,7 +1458,7 @@ def attrs(
     :param bool match_args:
         If `True` (default), set ``__match_args__`` on the class to support
         `PEP 634 <https://www.python.org/dev/peps/pep-0634/>`_ (Structural
-        Pattern Matching). It is a tuple of all positional-only ``__init__``
+        Pattern Matching). It is a tuple of all non-keyword-only ``__init__``
         parameter names on Python 3.10 and later. Ignored on older Python
         versions.