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gh-122623: Improve `c-api/bytearray.rst` with error handling info (#122624)

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@ -42,17 +42,22 @@ Direct API functions
Return a new bytearray object from any object, *o*, that implements the
:ref:`buffer protocol <bufferobjects>`.
On failure, return ``NULL`` with an exception set.
.. c:function:: PyObject* PyByteArray_FromStringAndSize(const char *string, Py_ssize_t len)
Create a new bytearray object from *string* and its length, *len*. On
failure, ``NULL`` is returned.
Create a new bytearray object from *string* and its length, *len*.
On failure, return ``NULL`` with an exception set.
.. c:function:: PyObject* PyByteArray_Concat(PyObject *a, PyObject *b)
Concat bytearrays *a* and *b* and return a new bytearray with the result.
On failure, return ``NULL`` with an exception set.
.. c:function:: Py_ssize_t PyByteArray_Size(PyObject *bytearray)