Update SUMMARY.md

SUMMARY.md

@@ -22,6 +22,7 @@
     * [Start to dive into interrupts](interrupts/interrupts-2.md)
     * [Interrupt handlers](interrupts/interrupts-3.md)
     * [Initialization of non-early interrupt gates](interrupts/interrupts-4.md)
+    * [Implementation of some exception handlers](interrupts/interrupts-5.md)
 * [Memory management](mm/README.md)
     * [Memblock](mm/linux-mm-1.md)
     * [Fixmaps and ioremap](mm/linux-mm-2.md)