Feedback for “Getting started on the server”

Here is an example from the documentation:

```js
export const saveStorageIds = mutation({
args: {
storageId: v.string("_storage"),
},
handler: async (ctx, args) => {

ctx.db.insert("someTable", {
storageId: args.storageId,
})
},
})
```

Where does "_storage" come from? Is that the name of the table? It could be helpful to see an example of the schema, to better link it all together while learning about how to handle the storage.