Tutorial chapter 10 looks like an outdated version of chapter 9

[vladistan]

Describe the bug

Looks like chapter 09 and 10 of the tutorial are identical, is it work in progress or some editing oversight?

To reproduce
Steps to reproduce the behavior:

1. Go to https://linkml.io/linkml/intro/tutorial09.html and compare it to https://linkml.io/linkml/intro/tutorial10.html

Looks line the same content, I downloaded the repo and compared the files, diff output is below

$ diff tutorial09.md tutorial10.md  
1c1
< # Part 9: Working with SQL databases
---
> # Part 10: Working with SQL databases
7c7
<     - Currently only Python / SQL Alchemy ORM layers are supported
---
>     - Currently only Python / SQL Alchemy ORM layesr are supported
24c24
< Use the [gen-sqltables](/generators/sqltable) command to make a SQL schema:
---
> Use the `gen-sqltables` command to make a SQL schema:
226c226
< Currently the only ORM directly supported is SQL Alchemy.
---
> Currently the only ORM directly supported in SQL Alchemy
230c230
< [SQL Alchemy](https://docs.sqlalchemy.org/) is a SQL framework for python. It has a core layer, and an ORM layer.
---
> [SQL Alchemy](https://docs.sqlalchemy.org/) is a SQL framework for python. It has a core layer, and an ORM later.
235c235
< gen-sqla -s personinfo.yaml
---

Looks like there are very minor differences

Expected behavior

Different content in these files or remove chapter 10