doc: update iasm sample to use $-prefixed label references

doc/sample/Person.iasm

@@ -156,33 +156,33 @@
 
 	ldr x2, [pool, #4]
 	c.eq x1, x2
-	br.t L0001
+	br.t $L0001
 
 	ldr x2, [pool, #5]
 	c.eq x1, x2
-	br.t L0002
+	br.t $L0002
 
 	ldr x2, [pool, #6]
 	c.eq x1, x2
-	br.t L0003
+	br.t $L0003
 
 	ldr x0, #0
 	str x0, [self, #1]
 
-	br L0004
+	br $L0004
 
 L0001:	str x0, [self, #2]
-	br L0004
+	br $L0004
 
 L0002:	ldr x3, #12
 	div x3, x0, x3
 	str x3, [self, #2]
-	br L0004
+	br $L0004
 
 L0003:	ldr x3, #365
 	div x3, x0, x3
 	str x3, [self, #2]
-	br L0004
+	br $L0004
 L0004:
 	ret.n
 @end
@@ -192,15 +192,15 @@ L0004:
 
 	ldr x2, [pool, #4]	; x2 = #years
 	c.eq x1, x2
-	br.t L0001		; [jump] if units == #years
+	br.t $L0001		; [jump] if units == #years
 
 	ldr x2, [pool, #5]	; x2 = #months
 	c.eq x1, x2
-	br.t L0002		; [jump] if units == #years
+	br.t $L0002		; [jump] if units == #years
 
 	ldr x2, [pool, #6]	; x2 = #days
 	c.eq x1, x2
-	br.t L0003		; [jump] if units == #days
+	br.t $L0003		; [jump] if units == #days
 
 	ldr x0, #0		; else
 	ret			; return 0