docs: Fix "its" typo (#9825)

docs: fix "its" typo

packages/discord.js/src/util/Options.js

@@ -20,7 +20,7 @@ const { version } = require('../../package.json');
  * the client will spawn {@link ClientOptions#shardCount} shards. If set to `auto`, it will fetch the
  * recommended amount of shards from Discord and spawn that amount
  * @property {number} [closeTimeout=5_000] The amount of time in milliseconds to wait for the close frame to be received
- * from the WebSocket. Don't have this too high/low. Its best to have it between 2_000-6_000 ms.
+ * from the WebSocket. Don't have this too high/low. It's best to have it between 2_000-6_000 ms.
  * @property {number} [shardCount=1] The total amount of shards used by all processes of this bot
  * (e.g. recommended shard count, shard count of the ShardingManager)
  * @property {CacheFactory} [makeCache] Function to create a cache.

packages/rest/src/lib/REST.ts

@@ -317,7 +317,7 @@ export class REST extends AsyncEventEmitter<RestEventsMap> {
 			headers.Authorization = `${request.authPrefix ?? this.options.authPrefix} ${this.#token}`;
 		}
 
-		// If a reason was set, set it's appropriate header
+		// If a reason was set, set its appropriate header
 		if (request.reason?.length) {
 			headers['X-Audit-Log-Reason'] = encodeURIComponent(request.reason);
 		}