Fixed grammar on lines 7, 9 and 11 (#31795)

guide/english/python/lists/list-append-method/index.md

@@ -6,14 +6,14 @@ title: List Append Method
 There are many methods for lists, you can explore all of them by typing `help(list)` in your python console.
 One of them is the `append()` function which, as the name says, appends/adds the argument to the end of the given list.
 
-#### Example Usage
+#### Example Usage:
 
 ```py
 words = ["I", "love", "Python"]
 words.append("very much")
 print(words)
 ```
-#### Output
+#### Output:
 ```
 ['I', 'love', 'Python', 'very much']
 ```