Documentation/cxl: Add bus internal docs

Kernel docs are already present in this file, but nothing is instructed
to generate them. Address that.

Acked-by: Jonathan Cameron <[email protected]>
Signed-off-by: Ben Widawsky <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dan Williams <[email protected]>

Author: Ben Widawsky

Documentation/driver-api/cxl/memory-devices.rst

@@ -39,6 +39,9 @@ CXL Core
 .. kernel-doc:: drivers/cxl/core/bus.c
    :doc: cxl core
 
+.. kernel-doc:: drivers/cxl/core/bus.c
+   :identifiers:
+
 .. kernel-doc:: drivers/cxl/core/pmem.c
    :doc: cxl pmem