Update store/cachekv/store.go

Signed-off-by: yihuang <huang@crypto.com>

store/cachekv/store.go

@@ -51,7 +51,7 @@ func (store *GStore[V]) GetStoreType() types.StoreType {
 }
 
 // Clone creates a copy-on-write snapshot of the cache store,
-// it only performs a shadowed copy so is very fast.
+// it only performs a shallow copy so is very fast.
 func (store *GStore[V]) Clone() types.BranchStore {
 	return &GStore[V]{
 		writeSet: store.writeSet.Copy(),