docs: correct link

docs/migrating_to_5.pug

@@ -105,7 +105,7 @@ block content
       Connection Logic and `useMongoClient`
     </a></h3>
 
-    The [`useMongoClient` option](http://mongoosejs.com/docs/4.x/docs/connections.html#use-mongo-client) was
+    The [`useMongoClient` option](/docs/4.x/docs/connections.html#use-mongo-client) was
     removed in Mongoose 5, it is now always `true`. As a consequence, Mongoose 5
     no longer supports several function signatures for `mongoose.connect()` that
     worked in Mongoose 4.x if the `useMongoClient` option was off. Below are some
@@ -489,7 +489,7 @@ block content
     </a></h3>
 
     Mongoose 5.x uses version 3.x of the [MongoDB Node.js driver](http://npmjs.com/package/mongodb). MongoDB driver 3.x changed the format of
-    the result of [`bulkWrite()` calls](http://mongoosejs.com//docs/api.html#model_Model.bulkWrite) so there is no longer a top-level `nInserted`, `nModified`, etc. property. The new result object structure is [described here](http://mongodb.github.io/node-mongodb-native/3.1/api/Collection.html#~BulkWriteOpResult).
+    the result of [`bulkWrite()` calls](/docs/api.html#model_Model.bulkWrite) so there is no longer a top-level `nInserted`, `nModified`, etc. property. The new result object structure is [described here](http://mongodb.github.io/node-mongodb-native/3.1/api/Collection.html#~BulkWriteOpResult).
 
     ```javascript
     const Model = mongoose.model('Test', new Schema({ name: String }));
@@ -569,4 +569,4 @@ block content
 
     ```javascript
     mongoose.connect(uri, { tlsInsecure: false }); // Opt out of additional SSL validation
-    ```
+    ```