Missing : in "sqlite::memory:" (docs) (#13599)

* Missing : in "sqlite::memory:"

* Update model-basics.md

Co-authored-by: Sascha Depold <sdepold@users.noreply.github.com>

docs/manual/core-concepts/model-basics.md

@@ -51,7 +51,7 @@ console.log(User === sequelize.models.User); // true
 
 ```js
 const { Sequelize, DataTypes, Model } = require('sequelize');
-const sequelize = new Sequelize('sqlite::memory');
+const sequelize = new Sequelize('sqlite::memory:');
 
 class User extends Model {}