Add comment for clearColor

Author: t0maboro

ios/gamma/modals/form-sheet/RNSFormSheetContentView.mm

@@ -5,6 +5,9 @@ @implementation RNSFormSheetContentView
 - (instancetype)initWithFrame:(CGRect)frame
 {
   if (self = [super initWithFrame:frame]) {
+    // Explicitly set to clearColor since this UIView is manually added
+    // into the view hierarchy. This ensures it doesn't interfere with
+    // any background colors defined by child React subviews.
     self.backgroundColor = [UIColor clearColor];
   }
   return self;