chore: Miscellaneous fixes

#9271 djs

> Backports the following pull requests to version 13:
>
> * docs: describe private properties #8879
> * fix(snowflake): snowflakes length #9144
> * fix(Message): `bulkDeletable` permissions should be retrieved later for DMs #9146
> * fix(Message#editable): update editable check in threads locked #9216
> * fix: add support for new guild feature `GUILD_WEB_PAGE_VANITY_URL` #9219
> * fix(AutocompleteInteraction): Send `name_localizations` correctly #9238
> * fix(ThreadManager): Respect `cache` and `force` in fetching #9239
> * docs(FetchArchivedThreadOptions): `before` respects `archive_timestamp`, not creation timestamp #9240
> * refactor(FetchThreadsOptions): Remove `active` #9241
> * docs: differ `User#send` #9251
> * docs: add more examples #9252
> * fix(ClientUser): No mutation on edit #9259
> * fix: resolving string bitfield #9262
> * refactor: call `GuildBanManager#create()` directly #9263
> * docs(Role): Fix example for `comparePositionTo()` #9270
> * docs: fix compare position example #9272
> * fix: Keep symbols in actions manager #9293

src/managers/CachedManager.js

@@ -12,6 +12,13 @@ class CachedManager extends DataManager {
   constructor(client, holds, iterable) {
     super(client, holds);
 
+    /**
+     * The private cache of items for this manager.
+     * @type {Collection}
+     * @private
+     * @readonly
+     * @name CachedManager#_cache
+     */
     Object.defineProperty(this, '_cache', { value: this.client.options.makeCache(this.constructor, this.holds) });
 
     let cleanup = this._cache[_cleanupSymbol]?.();