ctypes docs: Fix array-length reference to "non-negative" from "positive" (GH-32097)

Author: Jongy

Doc/library/ctypes.rst

@@ -2512,7 +2512,7 @@ Arrays and pointers
    Abstract base class for arrays.
 
    The recommended way to create concrete array types is by multiplying any
-   :mod:`ctypes` data type with a positive integer.  Alternatively, you can subclass
+   :mod:`ctypes` data type with a non-negative integer.  Alternatively, you can subclass
    this type and define :attr:`_length_` and :attr:`_type_` class variables.
    Array elements can be read and written using standard
    subscript and slice accesses; for slice reads, the resulting object is