📝 Update includes in `docs/en/docs/how-to/extending-openapi.md` (#12562)

docs/en/docs/how-to/extending-openapi.md

@@ -43,25 +43,24 @@ For example, let's add <a href="https://github.com/Rebilly/ReDoc/blob/master/doc
 
 First, write all your **FastAPI** application as normally:
 
-```Python hl_lines="1  4  7-9"
+{* ../../docs_src/extending_openapi/tutorial001.py hl[1,4,7:9] *}
-{!../../docs_src/extending_openapi/tutorial001.py!}
+
-```
 
 ### Generate the OpenAPI schema
 
 Then, use the same utility function to generate the OpenAPI schema, inside a `custom_openapi()` function:
 
-```Python hl_lines="2  15-21"
+
-{!../../docs_src/extending_openapi/tutorial001.py!}
+
-```
+{* ../../docs_src/extending_openapi/tutorial001.py hl[2,15:21] *}
+
 
 ### Modify the OpenAPI schema
 
 Now you can add the ReDoc extension, adding a custom `x-logo` to the `info` "object" in the OpenAPI schema:
 
-```Python hl_lines="22-24"
+{* ../../docs_src/extending_openapi/tutorial001.py hl[22:24] *}
-{!../../docs_src/extending_openapi/tutorial001.py!}
+
-```
 
 ### Cache the OpenAPI schema
 
@@ -71,17 +70,18 @@ That way, your application won't have to generate the schema every time a user o
 
 It will be generated only once, and then the same cached schema will be used for the next requests.
 
-```Python hl_lines="13-14  25-26"
+
-{!../../docs_src/extending_openapi/tutorial001.py!}
+{* ../../docs_src/extending_openapi/tutorial001.py hl[13:14,25:26] *}
-```
+
 
 ### Override the method
 
 Now you can replace the `.openapi()` method with your new function.
 
-```Python hl_lines="29"
+
-{!../../docs_src/extending_openapi/tutorial001.py!}
+
-```
+{* ../../docs_src/extending_openapi/tutorial001.py hl[29] *}
+
 
 ### Check it