spelling corrections and example addition (#21268)

guide/english/python/python-f-strings/index.md

@@ -2,9 +2,9 @@
 title: Python f-strings
 ---
 # f-strings in Python
-In Python version 3.6, a new method of formatting strings was implemented. The new method is called Literal string interpolation (though commonly referred to as an f-string).
+In Python version 3.6, a new method of formatting strings was implemented. The new method is called Literal string interpolation (though commonly referred to as an f-string, due to f prefix at the beginning of the string).
 
-The use of f-string allows the programmer to dynamically insert a variable into a string in a clean and concise manner. In addition to inserting variables into a string this feature also also provides the ability for a programmer to evaluate expressions, join the contents of collection, and even invoke functions within the f-string.
+The use of f-string allows the programmer to dynamically insert a variable into a string in a clean and concise manner. In addition to inserting variables into a string this feature also provides the ability for a programmer to evaluate expressions, join the contents of collection, and even invoke functions within the f-string.
 
 To perform these dynamic behaviours within an f-string we wrap them inside curly brackets within the string, and prepend a lower case f to the beginning of the string (before the opening quote).
 
@@ -15,14 +15,30 @@ To perform these dynamic behaviours within an f-string we wrap them inside curly
 
 ```python
 name = 'Jon Snow'
-greeting = f'Hello! {name}'
+greeting = f'Hello! {name}.'
 print(greeting)
 ```
 
 #### Output
 
 ```
-Hello! Jon Snow
+Hello! Jon Snow.
+```
+
+### Multiple variables, of different types, can be inserted in the same string:
+
+### Input
+
+```python
+item_id = 'P12305'
+price = 425.50
+print(f'Item {item_id} costs {price} USD.')
+```
+
+#### Output
+
+```
+Item P12305 costs 425.50 USD.
 ```
 
 ### Evaluate an expression in a string: