x86/irq/i8259: Fix kernel-doc annotation warning

Fix this warning:

  arch/x86/kernel/i8259.c:235: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
   * ELCR registers (0x4d0, 0x4d1) control edge/level of IRQ
    CC      arch/x86/kernel/irqinit.o
Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230830131211.88226-1-vincenzopalazzodev@gmail.com

arch/x86/kernel/i8259.c

@@ -231,9 +231,7 @@ struct irq_chip i8259A_chip = {
 };
 
 static char irq_trigger[2];
-/**
- * ELCR registers (0x4d0, 0x4d1) control edge/level of IRQ
- */
+/* ELCR registers (0x4d0, 0x4d1) control edge/level of IRQ */
 static void restore_ELCR(char *trigger)
 {
 	outb(trigger[0], PIC_ELCR1);