fix(curriculum): correct symmetric difference wording and examples (freeCodeCamp#64512)

Co-authored-by: Ilenia M <[email protected]>
Co-authored-by: Dario <[email protected]>

Author: 3 people

curriculum/challenges/english/blocks/lecture-working-with-dictionaries-and-sets/683ec8fd8b21827317388a45.md

@@ -103,7 +103,7 @@ The difference operator `-` returns a new set with the elements of the first set
 my_set - your_set # {1, 5}
 ```
 
-The symmetric difference operator `^` returns a new set with the elements that are either on the first or the second set, but not both. In this case, 1 and 5 are in `my_set` but not in `your_set`, so they are included. And the number 6 is in `your_set` but not in `my_set`, so it's included as well:
+The symmetric difference operator `^` returns a new set with the elements that are either in the first or the second set, but not both. In this case, 1 and 5 are in `my_set` but not in `your_set`, so they are included. And the number 6 is in `your_set` but not in `my_set`, so it's included as well:
 
 ```python
 my_set ^ your_set # {1, 5, 6}

curriculum/challenges/english/blocks/quiz-dictionaries-and-sets/67f412ac59601c4151b763da.md

@@ -466,7 +466,7 @@ It returns a new set with the elements of the first set that are not in the othe
 
 #### --answer--
 
-It returns a new set with the elements that are either on the first or the second set, but not both.
+It returns a new set with the elements that are either in the first or the second set, but not both.
 
 ### --question--
 

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

@@ -241,7 +241,7 @@ my_set.clear()
 - **`issubset()` and `issuperset()` Methods**: The `issubset()` and the `issuperset()` methods check if a set is a subset or superset of another set, respectively.
 
 ```python
-my_set = {1, 2, 3, 4, 5} 
+my_set = {1, 2, 3, 4, 5}
 your_set = {2, 3, 4, 5}
 
 print(your_set.issubset(my_set)) # True
@@ -251,37 +251,52 @@ print(my_set.issuperset(your_set)) # True
 - **`isdisjoint()` Method**: The `isdisjoint()` method checks if two sets are disjoint, if they don't have elements in common.
 
 ```python
-print(my_set.isdisjoint(your_set)) # False
+my_set = {1, 2, 3}
+your_set = {4, 5, 6}
+
+print(my_set.isdisjoint(your_set)) # True
 ```
 
 - **Union Operator (`|`)**: The union operator `|` returns a new set with all the elements from both sets.
 
 ```python
+my_set = {1, 2, 3}
+your_set = {4, 5, 6}
+
 my_set | your_set # {1, 2, 3, 4, 5, 6}
 ```
 
 - **Intersection Operator (`&`)**: The intersection operator `&` returns a new set with only the elements that the sets have in common.
 
 ```python
+my_set = {1, 2, 3, 4, 5}
+your_set = {2, 3, 4, 6}
+
 my_set & your_set # {2, 3, 4}
 ```
 
 - **Difference Operator (`-`)**: The difference operator `-` returns a new set with the elements of the first set that are not in the other sets.
 
 ```python
+my_set = {1, 2, 3, 4, 5}
+your_set = {2, 3, 4, 6}
+
 my_set - your_set # {1, 5}
 ```
 
-- **Symmetric Difference Operator (`^`)**: The symmetric difference operator `^` returns a new set with the elements that are either on the first or the second set, but not both.
+- **Symmetric Difference Operator (`^`)**: The symmetric difference operator `^` returns a new set with the elements that are either in the first or the second set, but not both.
 
 ```python
+my_set = {1, 2, 3, 4, 5}
+your_set = {2, 3, 4, 6}
+
 my_set ^ your_set # {1, 5, 6}
 ```
 
 - **`in` Operator**: You can check if an element is in a set or not with the `in` operator.
 
 ```python
-print(5 in my_set)
+print(5 in my_set) # True
 ```
 
 ## Python Standard Library

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

@@ -1807,7 +1807,7 @@ my_set.clear()
 - **`issubset()` and `issuperset()` Methods**: The `issubset()` and the `issuperset()` methods check if a set is a subset or superset of another set, respectively.
 
 ```python
-my_set = {1, 2, 3, 4, 5} 
+my_set = {1, 2, 3, 4, 5}
 your_set = {2, 3, 4, 5}
 
 print(your_set.issubset(my_set)) # True
@@ -1817,30 +1817,45 @@ print(my_set.issuperset(your_set)) # True
 - **`isdisjoint()` Method**: The `isdisjoint()` method checks if two sets are disjoint, if they don't have elements in common.
 
 ```python
-print(my_set.isdisjoint(your_set)) # False
+my_set = {1, 2, 3}
+your_set = {4, 5, 6}
+
+print(my_set.isdisjoint(your_set)) # True
 ```
 
 - **Union Operator (`|`)**: The union operator `|` returns a new set with all the elements from both sets.
 
 ```python
+my_set = {1, 2, 3}
+your_set = {4, 5, 6}
+
 my_set | your_set # {1, 2, 3, 4, 5, 6}
 ```
 
 - **Intersection Operator (`&`)**: The intersection operator `&` returns a new set with only the elements that the sets have in common.
 
 ```python
+my_set = {1, 2, 3, 4, 5}
+your_set = {2, 3, 4, 6}
+
 my_set & your_set # {2, 3, 4}
 ```
 
 - **Difference Operator (`-`)**: The difference operator `-` returns a new set with the elements of the first set that are not in the other sets.
 
 ```python
+my_set = {1, 2, 3, 4, 5}
+your_set = {2, 3, 4, 6}
+
 my_set - your_set # {1, 5}
 ```
 
-- **Symmetric Difference Operator (`^`)**: The symmetric difference operator `^` returns a new set with the elements that are either on the first or the second set, but not both.
+- **Symmetric Difference Operator (`^`)**: The symmetric difference operator `^` returns a new set with the elements that are either in the first or the second set, but not both.
 
 ```python
+my_set = {1, 2, 3, 4, 5}
+your_set = {2, 3, 4, 6}
+
 my_set ^ your_set # {1, 5, 6}
 ```