chore: update titles

Author: wilfredinni

docs/cheatsheet/lists-and-tuples.md

@@ -230,7 +230,7 @@ The multiple assignment trick can also be used to swap the values in two variabl
 # 1
 ```
 
-## Adding Values with append() and insert()
+## Adding Values
 
 ### append()
 
@@ -254,7 +254,7 @@ The multiple assignment trick can also be used to swap the values in two variabl
 # ['table', 'bed', 'chair', 'rack', 'shelf']
 ```
 
-## Removing values with del(), remove() and pop()
+## Removing Values
 
 ### del()
 
@@ -311,7 +311,7 @@ By default, `pop` will remove and return the last item of the list. You can also
 ['bat', 'rat']
 ```
 
-## Sorting values with sort
+## Sorting values with sort()
 
 ```python
 >>> numbers = [2, 5, 3.14, 1, -7]