Fix DeviceProperties documentation by using cyclass.rst template

DeviceProperties is a Cython cdef class, but was being documented
without specifying the cyclass.rst template. This caused Sphinx to
use the default class template which uses autoproperty, which doesn't
work correctly with Cython extension types.

The cyclass.rst template uses autoattribute instead, which properly
documents the properties of Cython classes.

Fixes #1215

Author: kkraus14

cuda_core/docs/source/api_private.rst

@@ -22,14 +22,17 @@ CUDA runtime
    _memory._virtual_memory_resource.VirtualMemoryGranularityT
    _memory._virtual_memory_resource.VirtualMemoryAccessTypeT
    _memory._virtual_memory_resource.VirtualMemoryHandleTypeT
-   _device.DeviceProperties
    _memory._ipc.IPCAllocationHandle
    _memory._ipc.IPCBufferDescriptor
    _module.KernelAttributes
    _module.KernelOccupancy
    _module.ParamInfo
    _module.MaxPotentialBlockSizeOccupancyResult
 
+   :template: autosummary/cyclass.rst
+
+   _device.DeviceProperties
+
 
 CUDA protocols
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