xinput: add list-props and set-prop examples (#6205)

pages/linux/xinput.md

@@ -21,3 +21,11 @@
 - Reattach an input as slave to a master:
 
 `xinput reattach {{id}} {{master_id}}`
+
+- List settings of an input device:
+
+`xinput list-props {{id}}`
+
+- Change a setting of an input device:
+
+`xinput set-prop {{id}} {{setting_id}} {{value}}`