docs: support docs versioning, new update hook decorators docs added

website/versioned_docs/version-1.3.0/api-reference/decorators.md

@@ -0,0 +1,23 @@
+---
+id: decorators
+title: Decorators
+sidebar_label: Decorators
+slug: /api-reference/decorators
+---
+
+:::caution
+The described functionality is under development, the functionality has not been tested and can be changed at any time!
+:::
+
+### Update
+
+`@Update` class decorator, it's like NestJS [`@Controller`](https://docs.nestjs.com/controllers) decorator, but for [Telegram Bot API updates](https://core.telegram.org/bots/api#getting-updates). Reserved for future use.
+
+```typescript {3}
+import { Update, Context } from 'nestjs-telegraf';
+
+@Update()
+export class SomeBotService {
+  ...
+}
+```