Update documentation for adjust schema

https://kotlin.github.io/dataframe/adjustschema.html
Suggestions:
Add information about castTo(schemaFrom: Function>) - kdoc provides an example,
and castTo(schemaFrom: DataFrame) - there's info in https://kotlin.github.io/dataframe/cast.html

```
This argument is used to generate [extension properties](https://kotlin.github.io/dataframe/extensionpropertiesapi.html) for typed data access.
```
->
```
This arguments is used to resolve generated extension properties for typed data access.
```