I'm not sure if this is normal? Not every leaf has this but lots of them do
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Looks like a little wind. It won't affect the quality for culinary use, but possibly aesthetically as a garnish. Looks like Italian parsley, so not generally used as a garnish anyway. The plant looks quite healthy otherwise, so I wouldn't worry about it, but for next time, keep in mind that leaf tips on the outermost leaves are the most liable to sustain wind burn.
This is normal for many plants, not just parsley. To prevent it, you'll need to come up with a way to block the worst of the wind. Also, harvesting the oldest leaves first (the ones emerging from the outside of the rosette) will keep the plant growing, and keep the leaves fresh. There won't be as many blemished or yellowing leaves, and the plant will produce much more than if the plant is harvested all at once, even if allowed to regrow.