fixed formatting

source/tuna-salad.md

@@ -4,13 +4,13 @@
 
 - **4 5oz cans** tuna packed in water, drained
 - **1 cup** mayonnaise
-- **1 rib** celery, finely chopped (about 1/3 cup)
+- **1 rib** celery, finely chopped (about 1⁄3 cup)
 - **2 tbsp.** red onion, minced (about 2 small slices)
 - **2 tbsp.** sweet pickle or dill relish
 - **1 tbsp.** lemon juice
 - **1 clove** garlic, minced
-- **1/2 tsp.** table salt
-- **1/4 tsp.** ground black pepper
+- **1⁄2 tsp.** table salt
+- **1⁄4 tsp.** ground black pepper
 
 ## Instructions