fixed: typo referencing old blurls (#216)

Also add an example on how to unset a layer rule

pages/Configuring/Keywords.md

@@ -160,12 +160,18 @@ layerrule = blur,address:0x<ADDRESS>
 
 you can get the namespace / address from `hyprctl layers`.
 
-To remove a blurls rule (useful in dynamic situations) use:
+To remove a layer rule (useful in dynamic situations) use:
 
 ```ini
 layerrule = unset,<whatever you used before>
 ```
 
+For example:
+
+```ini
+layerrule = unset,NAMESPACE
+```
+
 # Setting the environment
 
 {{< hint type=note >}}