chore: added comments

crates/rollup/src/driver/context/exex.rs

@@ -7,6 +7,12 @@ use tokio::sync::mpsc::error::SendError;
 
 use crate::driver::{ChainNotification, DriverContext};
 
+/// Execution extension Hera context.
+///
+/// This context is used to bridge the gap between the execution extension
+/// and the Hera pipeline. It receives notifications from the execution extension
+/// and forwards them to the Hera pipeline. It also maintains a shared L1 cache of
+/// the chain to make it available to the rollup pipeline.
 pub struct ExExHeraContext<N: FullNodeComponents> {
     ctx: ExExContext<N>,
     l1_cache: InMemoryChainProvider,

crates/rollup/src/driver/context/standalone.rs

@@ -26,7 +26,11 @@ use super::{Blocks, ChainNotification, DriverContext};
 /// Equivalent to 2 epochs at 32 slots/epoch on Ethereum Mainnet.
 const FINALIZATION_TIMEOUT: u64 = 64;
 
-#[allow(unused)]
+/// A standalone context that polls for new blocks from an L1 node, depending
+/// on the URL scheme. Supported schemes are `http`, `ws`, and `file`.
+///
+/// If the URL scheme is `http`, the context will poll for new blocks using the
+/// `eth_getFilterChanges` if available, falling back to `eth_getBlockByNumber` if not.
 #[derive(Debug)]
 pub struct StandaloneHeraContext {
     /// The current tip of the L1 chain listener, used to detect reorgs