Oops, revert unwanted change used to create an example

Issue #26564.

Objects/bytearrayobject.c

@@ -2820,7 +2820,6 @@ bytearray_hex(PyBytesObject *self)
 {
     char* argbuf = PyByteArray_AS_STRING(self);
     Py_ssize_t arglen = PyByteArray_GET_SIZE(self);
-    PyByteArray_AS_STRING(self)[arglen+1] = 2;
     return _Py_strhex(argbuf, arglen);
 }