add the enum direct comments back (#2936)

AsyncDisplayKit/ASDisplayNode.h

@@ -56,11 +56,13 @@ typedef void (^ASDisplayNodeContextModifier)(CGContextRef context);
 typedef ASLayoutSpec * _Nonnull(^ASLayoutSpecBlock)(__kindof ASDisplayNode * _Nonnull node, ASSizeRange constrainedSize);
 
 /**
- Interface state is available on ASDisplayNode and ASViewController, and
+ * Interface state is available on ASDisplayNode and ASViewController, and
- allows checking whether a node is in an interface situation where it is prudent to trigger certain
+ * allows checking whether a node is in an interface situation where it is prudent to trigger certain
- actions: measurement, data loading, display, and visibility (the latter for animations or other onscreen-only effects).
+ * actions: measurement, data loading, display, and visibility (the latter for animations or other onscreen-only effects).
+ * 
+ * The defualt state, ASInterfaceStateNone, means that the element is not predicted to be onscreen soon and
+ * preloading should not be performed. Swift: use [] for the default behavior.
  */
-
 typedef NS_OPTIONS(NSUInteger, ASInterfaceState)
 {
   /** The element is not predicted to be onscreen soon and preloading should not be performed */

AsyncDisplayKit/ASMapNode.h

@@ -14,6 +14,11 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+/**
+  * Map Annotation options. 
+  * The default behavior is to ignore the annotations' positions, use the region or options specified instead.
+  * Swift: to select the default behavior, use [].
+  */
 typedef NS_OPTIONS(NSUInteger, ASMapNodeShowAnnotationsOptions)
 {
   /** The annotations' positions are ignored, use the region or options specified instead. */

AsyncDisplayKit/Layout/ASCenterLayoutSpec.h

@@ -10,7 +10,12 @@
 
 #import <AsyncDisplayKit/ASRelativeLayoutSpec.h>
 
-/** How the child is centered within the spec. */
+/** 
+  * How the child is centered within the spec.
+  *
+  * The default option will position the child at {0,0} relatively to the layout bound.
+  * Swift: use [] for the default behavior.
+  */
 typedef NS_OPTIONS(NSUInteger, ASCenterLayoutSpecCenteringOptions) {
   /** The child is positioned in {0,0} relatively to the layout bounds */
   ASCenterLayoutSpecCenteringNone = 0,
@@ -22,7 +27,12 @@ typedef NS_OPTIONS(NSUInteger, ASCenterLayoutSpecCenteringOptions) {
   ASCenterLayoutSpecCenteringXY = ASCenterLayoutSpecCenteringX | ASCenterLayoutSpecCenteringY
 };
 
-/** How much space the spec will take up. */
+/** 
+  * How much space the spec will take up.
+  *
+  * The default option will allow the spec to take up the maximum size possible.
+  * Swift: use [] for the default behavior.
+  */
 typedef NS_OPTIONS(NSUInteger, ASCenterLayoutSpecSizingOptions) {
   /** The spec will take up the maximum size possible */
   ASCenterLayoutSpecSizingOptionDefault = ASRelativeLayoutSpecSizingOptionDefault,

AsyncDisplayKit/Layout/ASRelativeLayoutSpec.h

@@ -12,7 +12,12 @@
 
 #import <AsyncDisplayKit/ASLayoutSpec.h>
 
-/** How the child is positioned within the spec. */
+/** 
+  * How the child is positioned within the spec.
+  *
+  * The default option will position the child at point 0.
+  * Swift: use [] for the default behavior.
+  */
 typedef NS_ENUM(NSUInteger, ASRelativeLayoutSpecPosition) {
   /** The child is positioned at point 0 */ 
   ASRelativeLayoutSpecPositionNone = 0,
@@ -24,7 +29,12 @@ typedef NS_ENUM(NSUInteger, ASRelativeLayoutSpecPosition) {
   ASRelativeLayoutSpecPositionEnd = 3,
 };
 
-/** How much space the spec will take up. */
+/** 
+  * How much space the spec will take up.
+  *
+  * The default option will allow the spec to take up the maximum size possible.
+  * Swift: use [] for the default behavior.
+  */
 typedef NS_OPTIONS(NSUInteger, ASRelativeLayoutSpecSizingOption) {
   /** The spec will take up the maximum size possible */
   ASRelativeLayoutSpecSizingOptionDefault,