Update Doc/c-api/bytearray.rst

Co-authored-by: Petr Viktorin <encukou@gmail.com>

Author: vstinner

Doc/c-api/bytearray.rst

@@ -17,7 +17,7 @@ Byte Array Objects
       The internal buffer of :c:type:`PyByteArrayObject` always includes an
       extra trailing null byte for compatibility with null terminated C
       strings.  This extra byte is not counted in :c:func:`PyByteArray_Size`
-      nor in the various *length* and *size* arguments of the functions below.
+      nor in the *len* arguments of the functions below.
 
 .. c:var:: PyTypeObject PyByteArray_Type