add linea ethers notes

Signed-off-by: nicholaspai <[email protected]>

src/gasPriceOracle/adapters/linea.ts

@@ -8,5 +8,9 @@ import * as ethereum from "./ethereum";
 import { GasPriceEstimateOptions } from "../oracle";
 
 export function eip1559(provider: providers.Provider, opts: GasPriceEstimateOptions): Promise<GasPriceEstimate> {
+  // We use the legacy method to call `eth_gasPrice` which empirically returns a more accurate
+  // gas price estimate than `eth_maxPriorityFeePerGas` or ethersProvider.getFeeData in the EIP1559 "raw" or "bad"
+  // cases. Based on testing `eth_gasPrice` returns the closest price to the Linea-specific `linea_estimateGas`
+  // endpoint which the Viem Linea adapter queries.
   return ethereum.legacy(provider, opts);
 }