Update lib/model.js

Co-authored-by: hasezoey <hasezoey@gmail.com>

lib/model.js

@@ -3375,7 +3375,7 @@ function _setIsNew(doc, val) {
  * trip to MongoDB.
  *
  * Mongoose will perform casting on all operations you provide.
- * The only exception [setting the `update` operator for `updateOne` or `updateMany` to a pipeline](https://www.mongodb.com/docs/manual/reference/method/db.collection.bulkWrite/#updateone-and-updatemany): Mongoose does **not** cast update pipelines.
+ * The only exception is [setting the `update` operator for `updateOne` or `updateMany` to a pipeline](https://www.mongodb.com/docs/manual/reference/method/db.collection.bulkWrite/#updateone-and-updatemany): Mongoose does **not** cast update pipelines.
  *
  * This function does **not** trigger any middleware, neither `save()`, nor `update()`.
  * If you need to trigger