adapted to Kick Assembler, some documentation update

c64/kernal/interrupts/nmi_handler.s

@@ -1,17 +1,17 @@
 
 nmi_handler:
 
-	sei ;; don't allow IRQ to interfere, see https://www.c64-wiki.com/wiki/Interrupt
+	sei // don't allow IRQ to interfere, see https://www.c64-wiki.com/wiki/Interrupt
 
-	;; Call interrupt routine (only if initialised)
+	// Call interrupt routine (only if initialised)
 	pha
 	lda NMINV
 	ora NMINV+1
-	beq +
+	beq !+
 	pla
 	jmp (NMINV)
-*
-	;; Vector not initialized - call default interrupt routine
+!:
+	// Vector not initialized - call default interrupt routine
 	pla
 	jmp default_nmi_handler