Merge pull request rails#50762 from p8/actiontext/document-associations-and-scopes

Document some ActionText methods [ci-skip]

Author: p8

actiontext/app/models/action_text/rich_text.rb

@@ -39,7 +39,16 @@ class RichText < Record
     serialize :body, coder: ActionText::Content
     delegate :to_s, :nil?, to: :body
 
+    ##
+    # :method: record
+    #
+    # Returns the associated record.
     belongs_to :record, polymorphic: true, touch: true
+
+    ##
+    # :method: embeds
+    #
+    # Returns the <tt>ActiveStorage::Blob</tt>s of the embedded files.
     has_many_attached :embeds
 
     before_save do

actiontext/lib/action_text/attribute.rb

@@ -76,6 +76,7 @@ def with_all_rich_text
         includes(rich_text_association_names)
       end
 
+      # Returns the names of all rich text associations.
       def rich_text_association_names
         reflect_on_all_associations(:has_one).collect(&:name).select { |n| n.start_with?("rich_text_") }
       end