timeConfig changes missing from v11 -> v12 migration guide

For example, in v11 the start time was configured via

```
<VueDatePicker
  :start-time="{ hours: 0, minutes: 0 }" />
```

In v12, this should be changed to

```
<VueDatePicker
  :time-config="{ startTime: { hours: 0, minutes: 0 } }" />
```

The migration guide doesn't mention `start-time` in the [prop changes section](https://vue3datepicker.com/migration/from-v11#props-changes)

