gateway: Add IntentMessageContent

See https://discord.com/developers/docs/topics/gateway#message-content-intent.

discord/component.go

@@ -250,7 +250,7 @@ func (c *ContainerComponents) UnmarshalJSON(b []byte) error {
 //
 //    - *ActionRowComponent
 //    - *ButtonComponent
-//    - *SelectComponent
+//    - *StringSelectComponent
 //    - *TextInputComponent
 //    - *UserSelectComponent
 //    - *RoleSelectComponent
@@ -581,7 +581,7 @@ func (b *ButtonComponent) UnmarshalJSON(j []byte) error {
 	return nil
 }
 
-// StringSelectComponent is a clickable button that may be added to an interaction
+// StringSelectComponent is a dropdown menu that may be added to an interaction
 // response.
 type StringSelectComponent struct {
 	// Options are the choices in the select.
@@ -605,7 +605,7 @@ type SelectOption struct {
 	// Value is the internal value that is echoed back to the program. It's
 	// similar to the custom ID. Max 100 characters.
 	Value string `json:"value"`
-	// Description is the additional description of an option.
+	// Description is the additional description of an option. Max 100 characters.
 	Description string `json:"description,omitempty"`
 	// Emoji is the optional emoji object.
 	Emoji *ComponentEmoji `json:"emoji,omitempty"`

gateway/intents.go

@@ -25,7 +25,7 @@ const (
 	IntentDirectMessages
 	IntentDirectMessageReactions
 	IntentDirectMessageTyping
-	_
+	IntentMessageContent
 	IntentGuildScheduledEvents
 )