Documentation/ABI/testing/debugfs-cxl: Add 'cxl' to clear_poison path

'cxl' is missing from the path to the clear_poison attribute. Add it.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20250724224308.2101255-1-alison.schofield@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

Author: AlisonSchofield

Documentation/ABI/testing/debugfs-cxl

@@ -20,7 +20,7 @@ Description:
 		visible for devices supporting the capability.
 
 
-What:		/sys/kernel/debug/memX/clear_poison
+What:		/sys/kernel/debug/cxl/memX/clear_poison
 Date:		April, 2023
 KernelVersion:	v6.4
 Contact:	linux-cxl@vger.kernel.org