update unavailable link in linux-interrupts-2.md

Signed-off-by: ruitianzhong <ruitian-zhong@outlook.com>

Interrupts/linux-interrupts-2.md

@@ -441,7 +441,7 @@ static inline void _set_gate(int gate, unsigned type, void *addr,
 }
 ```
 
-Here we start from the `pack_gate` function which takes clean `IDT` entry represented by the `gate_desc` structure and fills it with the base address and limit, [Interrupt Stack Table](https://www.kernel.org/doc/Documentation/x86/x86_64/kernel-stacks), [Privilege level](http://en.wikipedia.org/wiki/Privilege_level), type of an interrupt which can be one of the following values:
+Here we start from the `pack_gate` function which takes clean `IDT` entry represented by the `gate_desc` structure and fills it with the base address and limit, [Interrupt Stack Table](https://www.kernel.org/doc/Documentation/x86/kernel-stacks), [Privilege level](http://en.wikipedia.org/wiki/Privilege_level), type of an interrupt which can be one of the following values:
 
 * `GATE_INTERRUPT`
 * `GATE_TRAP`