Image `get_acess` property_list or not?

### Specification Version

SYCL 2020 (Revision 11)

### Section Number(s)

https://registry.khronos.org/SYCL/specs/sycl-2020/html/sycl-2020.html#_unsampled_image_interface

### Bug Description

- `get_access` on the synopsis have a property list, in the description they have not.
- DPCPP implement it with a `property_list`

Start with the SYCL 2020 section “unsampled_image_interface” linked in the issue, comparing the get_access synopsis with its description. Check the DPCPP implementation mentioned in the report, then update the specification so the property_list wording is consistent; done means the synopsis, description, and implementation agree.

Written by the indexing model from the issue text.