✨ Add docs and tests for Python 3.9 and Python 3.10 (#3712)

Co-authored-by: Thomas Grainger <tagrain@gmail.com>

docs/en/docs/tutorial/schema-extra-example.md

@@ -8,9 +8,17 @@ Here are several ways to do it.
 
 You can declare an `example` for a Pydantic model using `Config` and `schema_extra`, as described in <a href="https://pydantic-docs.helpmanual.io/usage/schema/#schema-customization" class="external-link" target="_blank">Pydantic's docs: Schema customization</a>:
 
-```Python hl_lines="15-23"
-{!../../../docs_src/schema_extra_example/tutorial001.py!}
-```
+=== "Python 3.6 and above"
+
+    ```Python hl_lines="15-23"
+    {!> ../../../docs_src/schema_extra_example/tutorial001.py!}
+    ```
+
+=== "Python 3.10 and above"
+
+    ```Python hl_lines="13-21"
+    {!> ../../../docs_src/schema_extra_example/tutorial001_py310.py!}
+    ```
 
 That extra info will be added as-is to the output **JSON Schema** for that model, and it will be used in the API docs.
 
@@ -25,9 +33,17 @@ When using `Field()` with Pydantic models, you can also declare extra info for t
 
 You can use this to add `example` for each field:
 
-```Python hl_lines="4  10-13"
-{!../../../docs_src/schema_extra_example/tutorial002.py!}
-```
+=== "Python 3.6 and above"
+
+    ```Python hl_lines="4  10-13"
+    {!> ../../../docs_src/schema_extra_example/tutorial002.py!}
+    ```
+
+=== "Python 3.10 and above"
+
+    ```Python hl_lines="2  8-11"
+    {!> ../../../docs_src/schema_extra_example/tutorial002_py310.py!}
+    ```
 
 !!! warning
     Keep in mind that those extra arguments passed won't add any validation, only extra information, for documentation purposes.
@@ -50,9 +66,17 @@ you can also declare a data `example` or a group of `examples` with additional i
 
 Here we pass an `example` of the data expected in `Body()`:
 
-```Python hl_lines="21-26"
-{!../../../docs_src/schema_extra_example/tutorial003.py!}
-```
+=== "Python 3.6 and above"
+
+    ```Python hl_lines="21-26"
+    {!> ../../../docs_src/schema_extra_example/tutorial003.py!}
+    ```
+
+=== "Python 3.10 and above"
+
+    ```Python hl_lines="19-24"
+    {!> ../../../docs_src/schema_extra_example/tutorial003_py310.py!}
+    ```
 
 ### Example in the docs UI
 
@@ -73,9 +97,17 @@ Each specific example `dict` in the `examples` can contain:
 * `value`: This is the actual example shown, e.g. a `dict`.
 * `externalValue`: alternative to `value`, a URL pointing to the example. Although this might not be supported by as many tools as `value`.
 
-```Python hl_lines="22-48"
-{!../../../docs_src/schema_extra_example/tutorial004.py!}
-```
+=== "Python 3.6 and above"
+
+    ```Python hl_lines="22-48"
+    {!> ../../../docs_src/schema_extra_example/tutorial004.py!}
+    ```
+
+=== "Python 3.10 and above"
+
+    ```Python hl_lines="20-46"
+    {!> ../../../docs_src/schema_extra_example/tutorial004_py310.py!}
+    ```
 
 ### Examples in the docs UI