core/rawdb: fix typo in comment (ethereum#25191)

Author: noirgif

core/rawdb/database.go

@@ -213,7 +213,7 @@ func NewDatabaseWithFreezer(db ethdb.KeyValueStore, freezer string, namespace st
 			// are contiguous, otherwise we might end up with a non-functional freezer.
 			if kvhash, _ := db.Get(headerHashKey(frozen)); len(kvhash) == 0 {
 				// Subsequent header after the freezer limit is missing from the database.
-				// Reject startup is the database has a more recent head.
+				// Reject startup if the database has a more recent head.
 				if *ReadHeaderNumber(db, ReadHeadHeaderHash(db)) > frozen-1 {
 					return nil, fmt.Errorf("gap (#%d) in the chain between ancients and leveldb", frozen)
 				}