firmware: xilinx: Remove kernel-doc marking in the code

Trivial fix.
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/f4c61cd5e45fab345c366a15766101408fbc3bcd.1670502727.git.michal.simek@amd.com

drivers/soc/xilinx/zynqmp_pm_domains.c

@@ -227,7 +227,7 @@ static struct generic_pm_domain *zynqmp_gpd_xlate
 			goto done;
 	}
 
-	/**
+	/*
 	 * Add index in empty node_id of power domain list as no existing
 	 * power domain found for current index.
 	 */