Fix bogus "annotation" reference in comment

SMCalloutView.h

@@ -54,7 +54,7 @@ extern NSTimeInterval const kSMCalloutViewRepositionDelayForUIScrollView;
 // Custom "content" view that can be any width/height. If this is set, title/subtitle/titleView/subtitleView are all ignored.
 @property (nonatomic, retain) UIView *contentView;
 
-// calloutOffset is the offset in screen points from the top-middle of the annotation view, where the anchor of the callout should be shown.
+// calloutOffset is the offset in screen points from the top-middle of the target view, where the anchor of the callout should be shown.
 @property (nonatomic, assign) CGPoint calloutOffset;
 
 @property (nonatomic, assign) SMCalloutAnimation presentAnimation, dismissAnimation; // default SMCalloutAnimationBounce, SMCalloutAnimationFade respectively