You must NEVER ever use notebook paper or grocery bag paper as a substitute for parchment paper, especially for cooking. You can use them as food wrappers for storing your food, but never use them as a baking paper. They can easily ignite even at fairly low temperatures, and you won’t want to watch your baking go up in flames. Also, the ink that is used in these types of paper can be very toxic if it comes into contact with your food, so not only would your oven be on fire, but your food would be toxic and ruined.
Regular paper is a no-go zone for cooking purposes. Use it for storage or freezing by all means, but keep regular paper away from anything hot and keep that ink away from your delicious baked goods and food. You do not want to be tasting toxic ink when you chow down on some lovely fresh food.