docs(read-replication.md): fix typo (#13179)

Co-authored-by: Selenium39 <a895484122@gmail.com>
Co-authored-by: wantao <wan.tao@cn.ricoh.com>

docs/manual/other-topics/read-replication.md

@@ -5,7 +5,7 @@ Sequelize supports [read replication](https://en.wikipedia.org/wiki/Replication_
 ```js
 ```js
 const sequelize = new Sequelize('database', null, null, {
 const sequelize = new Sequelize('database', null, null, {
   dialect: 'mysql',
   dialect: 'mysql',
-  port: 3306
+  port: 3306,
   replication: {
   replication: {
     read: [
     read: [
       { host: '8.8.8.8', username: 'read-1-username', password: process.env.READ_DB_1_PW },
       { host: '8.8.8.8', username: 'read-1-username', password: process.env.READ_DB_1_PW },