docs(Guild): fix setOwner() example (#6929)

Co-authored-by: Antonio Román <kyradiscord@gmail.com>

src/structures/Guild.js

@@ -1070,7 +1070,8 @@ class Guild extends AnonymousGuild {
    * @example
    * // Edit the guild owner
    * guild.setOwner(guild.members.cache.first())
-   *  .then(updated => console.log(`Updated the guild owner to ${updated.owner.displayName}`))
+   *  .then(guild => guild.fetchOwner())
+   *  .then(owner => console.log(`Updated the guild owner to ${owner.displayName}`))
    *  .catch(console.error);
    */
   setOwner(owner, reason) {