Required prerequisites

• Search the issue tracker to check if your feature has already been mentioned or rejected in other issues.

Describe the feature

The Quantum Kernel documentation lists allowed types. An example struct is there defined as follows:

class MySimpleStruct(object):
    def __init__(self):
        self.i = 0
        self.j = 0

Using a custom class as the one above and accessing its elements in a quantum kernel produces the following error:
cudaq.kernel.ast_bridge.CompilerError: struct_example.py:14: error: Invalid struct member: MySimpleStruct.i (members=[])
Since #1939, data structs can be defined as follows:

@dataclass
class MySimpleStruct:
    i : int
    j : int

The documentation should be updated accordingly.