Update 07.2.md (#289)

eBook/07.2.md

@@ -184,6 +184,7 @@ func main() {
 	Slice at 7 is 35  
 	Slice at 8 is 40  
 	Slice at 9 is 45  
+	
 	The length of slice1 is 10  
 	The capacity of slice1 is 10