Update llms.txt

Author: 0xLucca

llms.txt

@@ -640,7 +640,30 @@ decl_test_relay_chains! {
 - [**`decl_test_parachains`**](https://github.com/paritytech/polkadot-sdk/blob/{{dependencies.repositories.polkadot_sdk.version}}/cumulus/xcm/xcm-emulator/src/lib.rs#L590){target=\_blank} - defines runtime and configuration for the parachains. Example:
 
     ```rust
-    Error fetching snippet from https://raw.githubusercontent.com/paritytech/polkadot-sdk/refs/tags/polkadot-stable2412/cumulus/parachains/integration-tests/emulated/chains/parachains/assets/asset-hub-westend/src/lib.rs
+    // AssetHubWestend Parachain declaration
+decl_test_parachains! {
+	pub struct AssetHubWestend {
+		genesis = genesis::genesis(),
+		on_init = {
+			asset_hub_westend_runtime::AuraExt::on_initialize(1);
+		},
+		runtime = asset_hub_westend_runtime,
+		core = {
+			XcmpMessageHandler: asset_hub_westend_runtime::XcmpQueue,
+			LocationToAccountId: asset_hub_westend_runtime::xcm_config::LocationToAccountId,
+			ParachainInfo: asset_hub_westend_runtime::ParachainInfo,
+			MessageOrigin: cumulus_primitives_core::AggregateMessageOrigin,
+		},
+		pallets = {
+			PolkadotXcm: asset_hub_westend_runtime::PolkadotXcm,
+			Balances: asset_hub_westend_runtime::Balances,
+			Assets: asset_hub_westend_runtime::Assets,
+			ForeignAssets: asset_hub_westend_runtime::ForeignAssets,
+			PoolAssets: asset_hub_westend_runtime::PoolAssets,
+			AssetConversion: asset_hub_westend_runtime::AssetConversion,
+		}
+	},
+}
     ```
 
 - [**`decl_test_bridges`**](https://github.com/paritytech/polkadot-sdk/blob/{{dependencies.repositories.polkadot_sdk.version}}/cumulus/xcm/xcm-emulator/src/lib.rs#L1178){target=\_blank} - creates bridges between chains, specifying the source, target, and message handler. Example:
@@ -5376,7 +5399,18 @@ pub type Value<T: Config> = StorageValue<_, u32>;
 
 - New `StorageValue` format:
 ```rust
-Error fetching snippet from https://raw.githubusercontent.com/paritytech/polkadot-sdk/refs/tags/polkadot-stable2409-1/substrate/frame/examples/single-block-migrations/src/lib.rs
+/// Example struct holding the most recently set [`u32`] and the
+/// second most recently set [`u32`] (if one existed).
+#[docify::export]
+#[derive(
+	Clone, Eq, PartialEq, Encode, Decode, RuntimeDebug, scale_info::TypeInfo, MaxEncodedLen,
+)]
+pub struct CurrentAndPreviousValue {
+	/// The most recently set value.
+	pub current: u32,
+	/// The previous value, if one existed.
+	pub previous: Option<u32>,
+}
 
 #[pallet::storage]
 	pub type Value<T: Config> = StorageValue<_, CurrentAndPreviousValue>;