f remove stale partial comment

Author: TheBlueMatt

fuzz/src/indexedmap.rs

@@ -13,7 +13,6 @@ use hashbrown::HashSet;
 
 use crate::utils::test_logger;
 
-// Note that while we take the trees by &mut here
 fn check_eq(btree: &BTreeMap<u8, u8>, indexed: &IndexedMap<u8, u8>) {
 	assert_eq!(btree.len(), indexed.len());
 	assert_eq!(btree.is_empty(), indexed.is_empty());