@Retryable captureException type doesn't explain what it does in the JavaDoc

[mikehearn]

The JavaDoc for @Retryable(capturedException) says:

@return The capture exception types (defaults to RuntimeException)

which isn't helpful, as it tells you nothing beyond what the name already does. Given that there's already include/exclude control, what exactly is a "capture exception" and what is this for? The user guide doesn't inform either.