Wrong docs in sentry_link

[ueman]

Description

Hi there :)

I think theres a missing type in the "Additional graphql usage hints" section in the docs:

class OperationExceptionExtractor extends ExceptionCauseExtractor<T> {
  @override
  ExceptionCause? cause(T error) {
    return ExceptionCause(error.linkException, error.originalStackTrace);
  }
}

it seems that T should be OperationException instead

class OperationExceptionExtractor
    extends ExceptionCauseExtractor<OperationException> {
  @override
  ExceptionCause? cause(OperationException error) {
    return ExceptionCause(error.linkException, error.originalStackTrace);
  }
}

Originally reported at ueman/dart-packages#4