fix(curriculum): minor enhancement in few code examples (#64320)

curriculum/challenges/english/blocks/lecture-working-with-dictionaries-and-sets/683ec8e8a2389f713380fca8.md

@@ -54,6 +54,8 @@ This works exactly the same for `.keys()` if you need to iterate over the keys o
 for product in products.keys():
     print(product)
 
+# Or
+
 for product in products:
     print(product)
 ```

curriculum/challenges/english/blocks/review-dictionaries-and-sets/67f39babe1e2ec1fb6eea32a.md

@@ -117,6 +117,8 @@ Output:
 for product in products.keys():
     print(product)
 
+# Or
+
 for product in products:
     print(product)
 ```

curriculum/challenges/english/blocks/review-python/67f39e391c9b373069def02c.md

@@ -1682,6 +1682,8 @@ Output:
 ```python
 for product in products.keys():
     print(product)
+    
+# Or
 
 for product in products:
     print(product)