improve ConfigureEvmEnv docs

Author: Rjected

crates/node-api/src/evm/traits.rs

@@ -15,9 +15,14 @@ pub trait ConfigureEvm: ConfigureEvmEnv {
     }
 }
 
-/// This represents the set of methods used to configure the EVM's environment before block execution.
+/// This represents the set of methods used to configure the EVM's environment before block
+/// execution.
 pub trait ConfigureEvmEnv: Send + Sync + Unpin + Clone {
-    /// The type of the transaction metadata.
+    /// The type of the transaction metadata that should be used to fill fields in the transaction
+    /// environment.
+    ///
+    /// On ethereum mainnet, this is `()`, and on optimism these are the L1 fee fields and
+    /// additional L1 block info.
     type TxMeta;
 
     /// Fill transaction environment from a [Transaction] and the given sender address.

crates/node-optimism/src/evm.rs

@@ -47,13 +47,11 @@ impl ConfigureEvmEnv for OptimismEvmConfig {
 }
 
 impl ConfigureEvm for OptimismEvmConfig {
-    /// Returns new EVM with the given database
     fn evm<'a, DB: Database + 'a>(&self, db: DB) -> Evm<'a, (), DB> {
         let handler_cfg = HandlerCfg { spec_id: SpecId::LATEST, is_optimism: true };
         EvmBuilder::default().with_db(db).with_handler_cfg(handler_cfg).build()
     }
 
-    /// Returns a new EVM with the given inspector
     fn evm_with_inspector<'a, DB: Database + 'a, I>(&self, db: DB, inspector: I) -> Evm<'a, I, DB> {
         let handler_cfg = HandlerCfg { spec_id: SpecId::LATEST, is_optimism: true };
         EvmBuilder::default()