feat: add callout

pages/cookbook/nfts.mdx

@@ -1,7 +1,6 @@
 # Non-Fungible Tokens (NFTs)
 
-
-import { Callout, Tabs } from 'nextra/components';
+import { Callout } from 'nextra/components';
 
 This page lists common examples of working with [NFTs](https://docs.ton.org/develop/dapps/asset-processing/nfts).
 
@@ -183,9 +182,12 @@ receive(msg: NFTReportRoyaltyParams) {
 
 ## NFT Collection methods
 
-These methods are not part of any standard, and they will only work with [this specific implementation](https://github.com/ton-blockchain/token-contract/blob/main/nft/nft-collection.fc). Please keep this in mind before using them.
 
-Additionally, note that only NFT owners are allowed to use these methods.
+<Callout type="warning" emoji="⚠️">
+  These methods are not part of any standard, and they will only work with [this specific implementation](https://github.com/ton-blockchain/token-contract/blob/main/nft/nft-collection.fc). Please keep this in mind before using them.
+</Callout>
+
+Note that only NFT owners are allowed to use these methods.
 
 ### Deploy NFT