Update learn-nft-pallets.md and add asset hub (#5440)

* Update learn-nft-pallets.md and add asset hub

* update frame pallet link

* Update learn-nft-pallets.md

docs/learn/learn-nft-pallets.md

@@ -19,12 +19,14 @@ Assets is under construction.
 
 :::
 
-NFTs is a [FRAME pallet](https://polkadot.js.org/docs/substrate/extrinsics#nfts) currently deployed
-on Westmint, which provides a multitude of functions to interact with NFTs.
+NFTs is a [FRAME pallet](https://github.com/paritytech/polkadot-sdk/tree/master/substrate/frame/nfts#readme) currently deployed
+on Westmint testnet and {{ polkadot: Polkadot :polkadot }}{{ kusama: Kusama :kusama }} Asset Hub, which provides a multitude of functions to interact with NFTs.
 
 The pallet comes with a new way to configure NFTs, as well as configure collections and items.
 Pallet-level [feature flags](https://github.com/paritytech/substrate/pull/12367) allow disabling
-functionalities not needed in the runtime.
+functionalities not needed in the runtime. 
+
+Polkadot JS API for NFTs FRAME pallet can be found [here](https://polkadot.js.org/docs/substrate/extrinsics#nfts).
 
 ### Roles