fix comment

Author: methane

Diff for: driver_test.go

@@ -1614,8 +1614,7 @@ func TestCollation(t *testing.T) {
 	// https://mariadb.com/kb/en/setting-character-sets-and-collations/#changing-default-collation
 	// https://mariadb.com/kb/en/server-system-variables/#character_set_collations
 	// utf8mb4_general_ci, utf8mb3_general_ci will be overridden by default MariaDB.
-	// Collations other than charasets default are not overridden. So other utf8mb4_* and utf8mb3_*
-	// collations are safe.
+	// Collations other than charasets default are not overridden. So utf8mb4_unicode_ci is safe.
 	testCollations := []string{
 		"latin1_general_ci",
 		"binary",