[gtk-web: 2/5] language-bindings: update rust page to use gtk4-rs

[Emmanuele Bassi <ebassi src gnome org>]

commit 78c82ce5f1334d608838bacc17f366253da34b86
Author: Bilal Elmoussaoui <bil elmoussaoui gmail com>
Date:   Tue May 11 00:15:58 2021 +0200

    language-bindings: update rust page to use gtk4-rs

 _docs/language-bindings/rust.md | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)
---
diff --git a/_docs/language-bindings/rust.md b/_docs/language-bindings/rust.md
index e4dd403..e4ea922 100644
--- a/_docs/language-bindings/rust.md
+++ b/_docs/language-bindings/rust.md
@@ -5,21 +5,24 @@
 
 ## About
 
-[**gtk-rs**](https://gtk-rs.org/) project deals with the Rust bindings for GTK, Cairo, GtkSourceView and 
other GLib-compatible libraries.
+[**gtk-rs**](https://gtk-rs.org/) project deals with the Rust bindings for GTK, Cairo and other 
GLib-compatible libraries.
+
+The bindings of Cairo, Pango, Gio, Graphene, GLib are part of the the 
[gtk-rs](https://github.com/gtk-rs/gtk-rs/). While the bindings of GTK 4 are part of 
[gtk4-rs](https://github.com/gtk-rs/gtk4-rs/)
 
 ## gtk-rs Documentation
 
-There is an official [gtk-rs API Documentation](https://gtk-rs.org/docs/gtk/) for using GTK and Rust 
together.
+There is an official [gtk4-rs API Documentation](https://gtk-rs.org/gtk4-rs/git/docs/) for using GTK and 
Rust together.
 
 There are also a growing number of examples and thorough tests of language features in the test suite.
 
-You can see all the gtk-rs examples [here](https://github.com/gtk-rs/examples).
+You can see all the gtk-rs examples [here](https://github.com/gtk-rs/gtk4-rs/tree/master/examples).
 
 ## A Hello World app
 
 ```rust
-use gio::prelude::*;
 use glib::clone;
+// glib and other dependencies are re-exported from the gtk crate
+use gtk::glib;
 use gtk::prelude::*;
 
 // When the application is launched…
@@ -30,17 +33,16 @@ fn on_activate(application: &gtk::Application) {
     let button = gtk::Button::with_label("Hello World!");
     // … which closes the window when clicked
     button.connect_clicked(clone!(@weak window => move |_| window.close()));
-    window.add(&button);
-    window.show_all();
+    window.set_child(Some(&button));
+    window.present();
 }
 
 fn main() {
     // Create a new application
-    let app = gtk::Application::new(Some("com.github.gtk-rs.examples.basic"), Default::default())
-        .expect("Initialization failed...");
-    app.connect_activate(|app| on_activate(app));
+    let app = gtk::Application::new(Some("com.github.gtk-rs.examples.basic"), Default::default());
+    app.connect_activate(on_activate);
     // Run the application
-    app.run(&std::env::args().collect::<Vec<_>>());
+    app.run();
 }
 ```
 
@@ -50,16 +52,16 @@ This code depicts how to use GTK Rust binding for creating a simple Hello World
 
 ## Tutorials
 
-[**gtk-rs**](https://gtk-rs.org/) website lists various [tutorials](https://gtk-rs.org/docs-src/tutorial/) 
that range from introduction to the usage of Gtk-rs crates and much more. If you want more tutorials please 
refer to the [FAQ](https://gtk-rs.org/docs-src/faq) page on the gtk-rs website.
+[**gtk-rs**](https://gtk-rs.org/) website lists various [tutorials](https://gtk-rs.org/docs-src/tutorial/) 
that range from introduction to the usage of Gtk-rs crates and much more. An introduction to building GUI 
application with Rust and GTK 4 is also available in the form of a 
[book](https://gtk-rs.org/gtk4-rs/git/book/). If you want more tutorials please refer to the 
[FAQ](https://gtk-rs.org/docs-src/faq) page on the gtk-rs website.
 
 ## Contribute
 
-If you are interested in contributing to the gtk-rs binding project, you can get a head start by reading the 
instructions on how to get started for contributing to gtk-rs 
[here](https://github.com/gtk-rs/gtk#contribute).
+If you are interested in contributing to the gtk-rs binding project, you can get a head start by reading the 
instructions on how to get started for contributing to gtk-rs 
[here](https://github.com/gtk-rs/gtk4-rs#contribute).
 
-If you want to get in touch with the original source files, you can visit the project's [git 
repository](https://github.com/gtk-rs/gtk) on Gitlab.
+If you want to get in touch with the original source files, you can visit the project's [git 
repository](https://github.com/gtk-rs/gtk4-rs) on GitHub.
 
 ## See More
 
-* Project: [https://github.com/gtk-rs/gtk](https://github.com/gtk-rs/gtk)
-* Docs: [https://gtk-rs.org/docs/gtk/](https://gtk-rs.org/docs/gtk/)
-* Tutorial: [https://gtk-rs.org/docs-src/tutorial/](https://gtk-rs.org/docs-src/tutorial/)
+* Project: [https://github.com/gtk-rs/gtk4-rs](https://github.com/gtk-rs/gtk4-rs)
+* Docs: [https://gtk-rs.org/gtk4-rs/git/docs/](https://gtk-rs.org/gtk4-rs/git/docs/)
+* Book: [https://gtk-rs.org/gtk4-rs/git/book/](https://gtk-rs.org/gtk4-rs/git/book/)