docs: correct issue number re: #6796

lib/connection.js

@@ -548,7 +548,7 @@ Connection.prototype.dropDatabase = _wrapConnHelper(function dropDatabase(cb) {
   // If `dropDatabase()` is called, this model's collection will not be
   // init-ed. It is sufficiently common to call `dropDatabase()` after
   // `mongoose.connect()` but before creating models that we want to
-  // support this. See gh-6967
+  // support this. See gh-6796
   for (const name of Object.keys(this.models)) {
     delete this.models[name].$init;
   }