Marker comment ignored if immediately followed by anything other than newline

It is possible to place `+kubebuilder` marker comments in such a way that they do not work, but no error or other indication is given that they were ignored.

This is basically the same issue as #436 which was closed.

**To reproduce:**
This is taken from the CronJob Kubebuilder sample:

**Works**
```
// +kubebuilder:rbac:groups=batch.tutorial.kubebuilder.io,resources=cronjobs,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=batch.tutorial.kubebuilder.io,resources=cronjobs/status,verbs=get;update;patch
// +kubebuilder:rbac:groups=batch,resources=jobs,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=batch,resources=jobs/status,verbs=get

var (
scheduledTimeAnnotation = "batch.tutorial.kubebuilder.io/scheduled-at"
)
```

**Doesn't work**
```
// +kubebuilder:rbac:groups=batch.tutorial.kubebuilder.io,resources=cronjobs,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=batch.tutorial.kubebuilder.io,resources=cronjobs/status,verbs=get;update;patch
// +kubebuilder:rbac:groups=batch,resources=jobs,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=batch,resources=jobs/status,verbs=get
var (
scheduledTimeAnnotation = "batch.tutorial.kubebuilder.io/scheduled-at"
)
```

Somehow, the fact that there isn't a newline following the comments causes them to be missed when running `controller-gen`.