add salvo example in concepts section of introduction (#159)

Author: darixsamani

SeaORM/docs/01-introduction/03-sea-orm.md

@@ -12,4 +12,4 @@ These fields and their values are grouped in a Rust struct (a [`Model`](12-inter
 
 However, `Model` is for read operations only. To perform insert, update, or delete, you need to use [`ActiveModel`](12-internal-design/05-expanded-entity-format.md#active-model) which attaches a state on each field.
 
-Finally, there is no singleton (global context) in SeaORM. Application code is responsible for managing the ownership of the `DatabaseConnection`. We do provide integration examples for web frameworks including [Actix](https://github.com/SeaQL/sea-orm/tree/master/examples/actix_example), [axum](https://github.com/SeaQL/sea-orm/tree/master/examples/axum_example) and [poem](https://github.com/SeaQL/sea-orm/tree/master/examples/poem_example), [Loco](https://github.com/SeaQL/sea-orm/tree/master/examples/loco_example) to help you get started quickly.
+Finally, there is no singleton (global context) in SeaORM. Application code is responsible for managing the ownership of the `DatabaseConnection`. We do provide integration examples for web frameworks including [Actix](https://github.com/SeaQL/sea-orm/tree/master/examples/actix_example), [axum](https://github.com/SeaQL/sea-orm/tree/master/examples/axum_example), [poem](https://github.com/SeaQL/sea-orm/tree/master/examples/poem_example), [Loco](https://github.com/SeaQL/sea-orm/tree/master/examples/loco_example) and [salvo](https://github.com/SeaQL/sea-orm/tree/master/examples/salvo_example) to help you get started quickly.