✨ Add source examples for Python 3.10 and 3.9 with updated syntax (#842)

Co-authored-by: Esteban Maya Cadavid <emayacadavid9@gmail.com>

docs/tutorial/indexes.md

@@ -22,10 +22,22 @@ Fine, in that case, you can **sneak peek** the final code to create indexes here
 
 /// details | 👀 Full file preview
 
+//// tab | Python 3.10+
+
+```Python hl_lines="8  10"
+{!./docs_src/tutorial/indexes/tutorial002_py310.py!}
+```
+
+////
+
+//// tab | Python 3.7+
+
 ```Python hl_lines="8  10"
 {!./docs_src/tutorial/indexes/tutorial002.py!}
 ```
 
+////
+
 ///
 
 ..but if you are not an expert, **continue reading**, this will probably be useful. 🤓
@@ -263,34 +275,86 @@ The change in code is underwhelming, it's very simple. 😆
 
 Here's the `Hero` model we had before:
 
+//// tab | Python 3.10+
+
+```Python hl_lines="6"
+{!./docs_src/tutorial/where/tutorial001_py310.py[ln:1-8]!}
+
+# Code below omitted 👇
+```
+
+////
+
+//// tab | Python 3.7+
+
 ```Python hl_lines="8"
 {!./docs_src/tutorial/where/tutorial001.py[ln:1-10]!}
 
 # Code below omitted 👇
 ```
 
+////
+
 /// details | 👀 Full file preview
 
+//// tab | Python 3.10+
+
+```Python
+{!./docs_src/tutorial/where/tutorial001_py310.py!}
+```
+
+////
+
+//// tab | Python 3.7+
+
 ```Python
 {!./docs_src/tutorial/where/tutorial001.py!}
 ```
 
+////
+
 ///
 
 Let's now update it to tell **SQLModel** to create an index for the `name` field when creating the table:
 
+//// tab | Python 3.10+
+
+```Python hl_lines="6"
+{!./docs_src/tutorial/indexes/tutorial001_py310.py[ln:1-8]!}
+
+# Code below omitted 👇
+```
+
+////
+
+//// tab | Python 3.7+
+
 ```Python hl_lines="8"
 {!./docs_src/tutorial/indexes/tutorial001.py[ln:1-10]!}
 
 # Code below omitted 👇
 ```
 
+////
+
 /// details | 👀 Full file preview
 
+//// tab | Python 3.10+
+
+```Python
+{!./docs_src/tutorial/indexes/tutorial001_py310.py!}
+```
+
+////
+
+//// tab | Python 3.7+
+
 ```Python
 {!./docs_src/tutorial/indexes/tutorial001.py!}
 ```
 
+////
+
 ///
 
 We use the same `Field()` again as we did before, and set `index=True`. That's it! 🚀
@@ -313,6 +377,20 @@ The SQL database will figure it out **automatically**. ✨
 
 This is great because it means that indexes are very **simple to use**. But it might also feel counterintuitive at first, as you are **not doing anything** explicitly in the code to make it obvious that the index is useful, it all happens in the database behind the scenes.
 
+//// tab | Python 3.10+
+
+```Python hl_lines="5"
+# Code above omitted 👆
+
+{!./docs_src/tutorial/indexes/tutorial001_py310.py[ln:34-39]!}
+
+# Code below omitted 👇
+```
+
+////
+
+//// tab | Python 3.7+
+
 ```Python hl_lines="5"
 # Code above omitted 👆
 
@@ -321,12 +399,26 @@ This is great because it means that indexes are very **simple to use**. But it m
 # Code below omitted 👇
 ```
 
+////
+
 /// details | 👀 Full file preview
 
+//// tab | Python 3.10+
+
+```Python
+{!./docs_src/tutorial/indexes/tutorial001_py310.py!}
+```
+
+////
+
+//// tab | Python 3.7+
+
 ```Python
 {!./docs_src/tutorial/indexes/tutorial001.py!}
 ```
 
+////
+
 ///
 
 This is exactly the same code as we had before, but now the database will **use the index** underneath.
@@ -370,18 +462,44 @@ secret_name='Dive Wilson' age=None id=1 name='Deadpond'
 
 We are going to query the `hero` table doing comparisons on the `age` field too, so we should **define an index** for that one as well:
 
+//// tab | Python 3.10+
+
+```Python hl_lines="8"
+{!./docs_src/tutorial/indexes/tutorial002_py310.py[ln:1-8]!}
+
+# Code below omitted 👇
+```
+
+////
+
+//// tab | Python 3.7+
+
 ```Python hl_lines="10"
 {!./docs_src/tutorial/indexes/tutorial002.py[ln:1-10]!}
 
 # Code below omitted 👇
 ```
 
+////
+
 /// details | 👀 Full file preview
 
+//// tab | Python 3.10+
+
+```Python
+{!./docs_src/tutorial/indexes/tutorial002_py310.py!}
+```
+
+////
+
+//// tab | Python 3.7+
+
 ```Python
 {!./docs_src/tutorial/indexes/tutorial002.py!}
 ```
 
+////
+
 ///
 
 In this case, we want the default value of `age` to continue being `None`, so we set `default=None` when using `Field()`.