Minor documentation updates.

See <#326> for background.

Author: ioquatix

lib/async/node.rb

@@ -73,7 +73,7 @@ def initialize(parent = nil, annotation: nil, transient: false)
 			end
 		end
 
-		# @returns [Node] the root node in the hierarchy.
+		# @returns [Node] The root node in the hierarchy.
 		def root
 			@parent&.root || self
 		end
@@ -87,10 +87,10 @@ def root
 		# @attribute [Node] The parent node.
 		attr :parent
 
-		# @attribute children [Children | Nil] Optional list of children.
+		# @attribute [Children | Nil] Optional list of children.
 		attr :children
 
-		# A useful identifier for the current node.
+		# @attribute [String | Nil] A useful identifier for the current node.
 		attr :annotation
 
 		# Whether this node has any children.