Use cython_class template for SyclDevice, etc.

Author: oleksandr-pavlyk

docs/doc_sources/api_reference/dpctl/index.rst

@@ -26,6 +26,7 @@
 .. autosummary::
     :toctree: generated
     :nosignatures:
+    :template: autosummary/cython_class.rst
 
     SyclDevice
     SyclContext