cxl/region: describe targets and nr_targets members of cxl_region_params

Sphinx reported undescribed parameters in cxl_region_params struct:

./drivers/cxl/cxl.h:376: warning: Function parameter or member 'targets' not described in 'cxl_region_params'
./drivers/cxl/cxl.h:376: warning: Function parameter or member 'nr_targets' not described in 'cxl_region_params'

Describe these members.

Fixes: b9686e8c ("cxl/region: Enable the assignment of endpoint decoders to regions")
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20220804075448.98241-3-bagasdotme@gmail.comSigned-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/cxl/cxl.h

@@ -364,6 +364,8 @@ enum cxl_config_state {
  * @interleave_ways: number of endpoints in the region
  * @interleave_granularity: capacity each endpoint contributes to a stripe
  * @res: allocated iomem capacity for this region
+ * @targets: active ordered targets in current decoder configuration
+ * @nr_targets: number of targets
  *
  * State transitions are protected by the cxl_region_rwsem
  */