[LFS rebase] Update "Change Desktop Environment Documentation" for 24.04 release (#1392)

* Update desktop environment documentation for Pop!_OS 24.04

Updated documentation to reflect changes in Pop!_OS version 24.04, including the default desktop environment and installation instructions.

* Update documentation for COSMIC desktop environment

---------

Co-authored-by: Dmitry Yarygin <deemoun@users.noreply.github.com>
Co-authored-by: Thomas Zimmerman <41023059+thomas-zimmerman@users.noreply.github.com>

Author: 3 people

content/desktop-environment.md

@@ -1,7 +1,7 @@
 ---
-title: Change Desktop Environment (Pop!_OS 22.04)
+title: Change Desktop Environment (Pop!_OS 24.04)
 description: >
-  Pop!_OS 22.04 Comes with GNOME by default.  Follow these instructions to install additional desktop environments.
+  Pop!_OS 24.04 Comes with COSMIC by default.  Follow these instructions to install additional desktop environments.
 keywords:
   - desktop environment
   - MATE
@@ -19,13 +19,13 @@ section: pop
 tableOfContents: true
 ---
 
-Pop!\_OS and Ubuntu both include the GNOME desktop environment by default. A desktop environment is responsible for the look and feel of the graphical desktop, and includes many of the key programs that get used every day.
+Pop!\_OS has the COSMIC desktop environment by default. A desktop environment is responsible for the look and feel of the graphical desktop, and includes many of the key programs that get used every day.
 
 You can install an alternative desktop environment using the instructions below.
 
-> **Warning:** Installing other desktop environments may affect the visual style and functionality of the default GNOME desktop (on both Ubuntu and Pop!_OS).
+> **Warning:** Installing other desktop environments may affect the visual style and functionality of the default COSMIC desktop.
 
-If you run into trouble while using an alternative desktop environment, you may wish to revert to the default environment. To ensure the default GNOME desktop environment is installed in Pop!\_OS, install the `pop-desktop` package:
+If you run into trouble while using an alternative desktop environment, you may wish to revert to the default environment. To ensure the default COSMIC desktop environment is installed in Pop!\_OS, install the `pop-desktop` package:
 
 ```bash
 sudo apt install pop-desktop
@@ -37,7 +37,7 @@ For Ubuntu, install the `ubuntu-desktop` package instead:
 sudo apt install ubuntu-desktop
 ```
 
-The desktop environment acts as the top graphical layer of the OS. The desktop environment is launched by a display manager; Pop!\_OS and Ubuntu both use GDM (GNOME Display Manager) by default.
+The desktop environment acts as the top graphical layer of the OS. The desktop environment is launched by a display manager; Pop!\_OS has cosmic-greeter while Ubuntu uses GDM (GNOME Display Manager) by default.
 
 If multiple desktop environments are installed, GDM will display a gear icon, which will allow you to select the desktop environment you want to launch. You will need to either reboot or restart your display manager using `sudo systemctl restart gdm` before a newly-installed desktop environment will show up in the list of options.
 
@@ -75,7 +75,7 @@ sudo apt install cinnamon-desktop-environment
 
 ### GNOME
 
-While Pop and Ubuntu contain GNOME by default, both include a number of customizations to GNOME. You can also install a vanilla GNOME session to get the upstream GNOME experience.
+Pop!_OS 24.04 Comes with the new COSMIC desktop environment by default. You can also install a vanilla GNOME session to get the vanilla GNOME experience.
 
 ![GNOME](/images/desktop-environment/GNOME.png)