linux-interrupts-2: Remove wrong 's' @ end of a word

s/the `NULL` interrupts descriptor table/the `NULL` interrupt descriptor table/

Signed-off-by: Sebastian Fricke <sebastian.fricke.linux@gmail.com>

Interrupts/linux-interrupts-2.md

@@ -17,7 +17,7 @@ void go_to_protected_mode(void)
 }
 ```
 
-The `setup_idt` function is defined in the same source code file as the `go_to_protected_mode` function and just loads the address of the `NULL` interrupts descriptor table:
+The `setup_idt` function is defined in the same source code file as the `go_to_protected_mode` function and just loads the address of the `NULL` interrupt descriptor table:
 
 ```C
 static void setup_idt(void)