Documentation on settings needed

From the examples, it's unclear to me
* when the capture and insertion points are to be placed in the same xml element and what if anything is the effect of splitting them into separate elements
* when the class name for the insertion point is required to be set or to be left blank
* when one is to use `$this0` instead of `this`.

I wrote a silly example
```.scala
trait Noodle[T] {
def f: T // user provides code to calculate something
final def launch(): Unit = {...} // non-blocking call to schedule execution
final def get[T]: T = ... // blocking call to get result of f when complete
}
```
The implementations of `launch()` and `get` are not important; suffice to say, they work. I discovered by trial and error that the following settings would allow me to set a break in an an implementation of `f` and see the place where `launch` was called on the stack:
```.xml

```
Variations where I specified the `insert-class-name` rather than leaving it blank, or used `this` instead `$this0` didn't work. Separating the `insert-...` attributes into a second element continued to work. I'm pleased that I was able to configure this new functionality, but I'd like to understand better why the choices I ended up with were correct (and if there are better, perhaps more efficient choices).