fix: fuel example (#509)

Author: cctdaniel

pages/price-feeds/use-real-time-data/fuel.mdx

@@ -44,33 +44,34 @@ abi UpdatePrice {
     fn update_price_feeds(update_fee: u64, update_data: Vec<Bytes>);
 }
 
-const PYTH_CONTRACT_ID = 0x1ab91bc1402a187055d3e827017ace566a103ce2a4126517da5d656d6a436aea; // Testnet Contract
+const PYTH_MAINNET_CONTRACT_ID = 0x1c86fdd9e0e7bc0d2ae1bf6817ef4834ffa7247655701ee1b031b52a24c523da; // Mainnet Contract
+const PYTH_TESTNET_CONTRACT_ID = 0x25146735b29d4216639f7f8b1d7b921ff87a1d3051de62d6cceaacabeb33b8e7; // Testnet Contract
 const FUEL_ETH_BASE_ASSET_ID = 0xf8f8b6283d7fa5b672b530cbb84fcccb4ff8dc40f8176ef4544ddb1f1952ad07;
 
 impl UpdatePrice for Contract {
     fn valid_time_period() -> u64 {
-        let pyth_contract = abi(PythCore, PYTH_CONTRACT_ID);
+        let pyth_contract = abi(PythCore, PYTH_MAINNET_CONTRACT_ID);
         let period = pyth_contract.valid_time_period();
         period
     }
     fn get_price(price_feed_id: PriceFeedId) -> Price {
-        let pyth_contract = abi(PythCore, PYTH_CONTRACT_ID);
+        let pyth_contract = abi(PythCore, PYTH_MAINNET_CONTRACT_ID);
         let price = pyth_contract.price(price_feed_id);
         price
     }
     fn get_price_unsafe(price_feed_id: PriceFeedId) -> Price {
-        let pyth_contract = abi(PythCore, PYTH_CONTRACT_ID);
+        let pyth_contract = abi(PythCore, PYTH_MAINNET_CONTRACT_ID);
         let price = pyth_contract.price_unsafe(price_feed_id);
         price
     }
     fn update_fee(update_data: Vec<Bytes>) -> u64 {
-        let pyth_contract = abi(PythCore, PYTH_CONTRACT_ID);
+        let pyth_contract = abi(PythCore, PYTH_MAINNET_CONTRACT_ID);
         let fee = pyth_contract.update_fee(update_data);
         fee
     }
     #[payable]
     fn update_price_feeds(update_fee: u64, update_data: Vec<Bytes>) {
-        let pyth_contract = abi(PythCore, PYTH_CONTRACT_ID);
+        let pyth_contract = abi(PythCore, PYTH_MAINNET_CONTRACT_ID);
         pyth_contract
             .update_price_feeds {
                 asset_id: FUEL_ETH_BASE_ASSET_ID,
@@ -101,7 +102,7 @@ The code snippet above does the following things:
    - `update_fee(update_data)`: Calculates the fee required to update the price feeds.
    - `update_price_feeds(update_fee, update_data)`: Updates the price feeds with the provided data and fee.
 
-3. Uses the `PYTH_CONTRACT_ID` constant to interact with the Pyth contract on testnet.
+3. Uses the `PYTH_MAINNET_CONTRACT_ID` constant to interact with the Pyth contract on testnet.
 4. Uses the `FUEL_ETH_BASE_ASSET_ID` constant as the asset ID for paying update fees.
 
 To use this contract, you would typically: