fix: code comments errors (#3180)

## Motivation

While reviewing documentation found several errors in comments

Author: intls

examples/matching-engine/src/contract.rs

@@ -471,7 +471,7 @@ impl MatchingEngineContract {
         match nature {
             OrderNature::Bid => {
                 // The order offers to buy token1 at price price_insert
-                // * When the old order was created fill of token1 were commited
+                // * When the old order was created fill of token1 were committed
                 //   by the seller.
                 // * When the new order is created price_insert * fill of token0
                 //   were committed by the buyer.
@@ -496,9 +496,9 @@ impl MatchingEngineContract {
             OrderNature::Ask => {
                 // The order offers to sell token1 at price price_insert
                 // * When the old order was created, price_level * fill of token0
-                //   had to be commited by the buyer.
+                //   had to be committed by the buyer.
                 // * When the new order is created, fill of token1 have to
-                //   be commited by the seller.
+                //   be committed by the seller.
                 // The result is that
                 // * price_insert * fill have to be sent to the seller
                 // * the buyer receives

linera-views/src/backends/dual.rs

@@ -33,7 +33,7 @@ pub enum StoreInUse {
     Second,
 }
 
-/// The trait for a (static) root key assignement.
+/// The trait for a (static) root key assignment.
 pub trait DualStoreRootKeyAssignment {
     /// Obtains the store assigned to this root key.
     fn assigned_store(root_key: &[u8]) -> Result<StoreInUse, bcs::Error>;
@@ -48,7 +48,7 @@ pub struct DualStore<S1, S2, A> {
     second_store: S2,
     /// Which store is currently in use given the root key. (The root key in the other store will be set arbitrarily.)
     store_in_use: StoreInUse,
-    /// Marker for the static root key assignement.
+    /// Marker for the static root key assignment.
     _marker: std::marker::PhantomData<A>,
 }