Rename Subxt metadata file to polkadot_testnet_metadata.scale

Author: brunopgalvao

.chain-interactions/query-data/runtime-api-calls.md

@@ -255,7 +255,7 @@ Select your preferred SDK below to see complete, runnable examples that query Po
     3. Download the Polkadot Hub TestNet metadata:
 
         ```bash
-        subxt metadata --url INSERT_WS_ENDPOINT -o asset_hub_metadata.scale
+        subxt metadata --url INSERT_WS_ENDPOINT -o polkadot_testnet_metadata.scale
         ```
 
         Ensure to replace `INSERT_WS_ENDPOINT` with the proper WebSocket endpoint, such as `wss://asset-hub-paseo.dotters.network` for Polkadot Hub TestNet.

.snippets/code/chain-interactions/query-data/runtime-api-calls/subxt/src/bin/runtime_apis.rs

@@ -4,8 +4,8 @@ use subxt::utils::AccountId32;
 use subxt::{OnlineClient, PolkadotConfig};
 
 // Generate an interface from the node's metadata
-#[subxt::subxt(runtime_metadata_path = "asset_hub_metadata.scale")]
-pub mod asset_hub {}
+#[subxt::subxt(runtime_metadata_path = "polkadot_testnet_metadata.scale")]
+pub mod polkadot_testnet {}
 
 const POLKADOT_TESTNET_RPC: &str = "INSERT_WS_ENDPOINT";
 
@@ -24,7 +24,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let account = AccountId32::from_str(ADDRESS)?;
 
     // Call AccountNonceApi using static interface
-    let nonce_call = asset_hub::apis()
+    let nonce_call = polkadot_testnet::apis()
         .account_nonce_api()
         .account_nonce(account.clone());
     let nonce = api.runtime_api().at_latest().await?.call(nonce_call).await?;