Example firestore.rules and description are not matched

In "12 Secure your data", below description is not match to example firestore.rules.

```
Updates to a restaurant document can only change the ratings, not the name or any other immutable data.
```

firestore.rules restrict to update only `name`.

```
allow update: if request.auth != null
&& request.resource.data.name == resource.data.name
```

Either description or firestore.rules is incorrect.
I think firestore.rules is incorrect. Probably this is correct rule.

```
allow update: if request.auth != null
&& request.resource.data.name == resource.data.name
&& request.resource.data.city == resource.data.city
&& request.resource.data.price == resource.data.price
&& request.resource.data.category == resource.data.category
&& request.resource.data.photo == resource.data.photo;
```