docs/typings(SystemChannelFlags): properly document and use resolvable (#3794)

- Change GuildEditData#systemChannelFlags to use SystemChannelFlagsResolvable
- Move SystemChannelFlagsResolvable outside of class definition to make the docs generator happy

src/util/SystemChannelFlags.js

@@ -8,16 +8,16 @@ const BitField = require('./BitField');
  * and by setting their corresponding flags you are disabling them</info>
  * @extends {BitField}
  */
-class SystemChannelFlags extends BitField {
-  /**
-   * Data that can be resolved to give a sytem channel flag bitfield. This can be:
-   * * A string (see {@link SystemChannelFlags.FLAGS})
-   * * A sytem channel flag
-   * * An instance of SystemChannelFlags
-   * * An Array of SystemChannelFlagsResolvable
-   * @typedef {string|number|SystemChannelFlags|SystemChannelFlagsResolvable[]} SystemChannelFlagsResolvable
-   */
-}
+class SystemChannelFlags extends BitField {}
+
+/**
+ * Data that can be resolved to give a sytem channel flag bitfield. This can be:
+ * * A string (see {@link SystemChannelFlags.FLAGS})
+ * * A sytem channel flag
+ * * An instance of SystemChannelFlags
+ * * An Array of SystemChannelFlagsResolvable
+ * @typedef {string|number|SystemChannelFlags|SystemChannelFlagsResolvable[]} SystemChannelFlagsResolvable
+ */
 
 /**
  * Numeric system channel flags. All available properties:

typings/index.d.ts

@@ -2334,7 +2334,7 @@ declare module 'discord.js' {
 		defaultMessageNotifications?: DefaultMessageNotifications | number;
 		afkChannel?: ChannelResolvable;
 		systemChannel?: ChannelResolvable;
-		systemChannelFlags?: SystemChannelFlags;
+		systemChannelFlags?: SystemChannelFlagsResolvable;
 		afkTimeout?: number;
 		icon?: Base64Resolvable;
 		owner?: GuildMemberResolvable;