docs: Update add attachments docs

Author: szuperaz

projects/stream-chat-angular/src/lib/attachment.service.ts

@@ -94,10 +94,10 @@ export class AttachmentService<
   }
 
   /**
-   * If you want to use custom attachments you can add them using this method.
+   * You can add custom `image`, `video` and `file` attachments using this method.
+   *
+   * Note: If you just want to use your own CDN for file uploads, you don't necessary need this method, you can just specify you own upload function in the [`ChannelService`](./ChannelService.mdx)
    *
-   * Note 1: If you just want to use your own CDN for file uploads, you don't necessary need this method, you can just specify you own upload function in the [`ChannelService`](./ChannelService.mdx)
-   * Note 2: If you want to use a custom attachment type that is not supported by the default [`AttachmentPreviewList`](../components/AttachmentPreviewListComponent.mdx) and [`AttachmentList`](../components/AttachmentListComponent.mdx) you'll have to provide you own UI for rendering them in the message input and message list.
    * @param attachment
    */
   addAttachment(attachment: Attachment<T>) {