ACPI: NVS: fix doc warnings in nvs.c

Fixes the following W=1 kernel build warning(s):

 drivers/acpi/nvs.c:94: warning: Function parameter or
  member 'start' not described in 'suspend_nvs_register'
 drivers/acpi/nvs.c:94: warning: Function parameter or
  member 'size' not described in 'suspend_nvs_register'
Signed-off-by: NBaokun Li <libaokun1@huawei.com>
[ rjw: Subject edits ]
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/nvs.c

@@ -83,8 +83,8 @@ static LIST_HEAD(nvs_list);
 
 /**
  * suspend_nvs_register - register platform NVS memory region to save
- *	@start - physical address of the region
- *	@size - size of the region
+ * @start: Physical address of the region.
+ * @size: Size of the region.
  *
  * The NVS region need not be page-aligned (both ends) and we arrange
  * things so that the data from page-aligned addresses in this region will