Update Debian package name for validation layers

Author: Overv

en/02_Development_environment.md

@@ -204,7 +204,7 @@ The most important components you'll need for developing Vulkan applications on
 
 * `sudo apt install vulkan-tools` or `sudo dnf install vulkan-tools`: Command-line utilities, most importantly `vulkaninfo` and `vkcube`. Run these to confirm your machine supports Vulkan.
 * `sudo apt install libvulkan-dev` or `sudo dnf install vulkan-loader-devel` : Installs Vulkan loader. The loader looks up the functions in the driver at runtime, similarly to GLEW for OpenGL - if you're familiar with that.
-* `sudo apt install vulkan-validationlayers-dev spirv-tools` or `sudo dnf install mesa-vulkan-devel vulkan-validation-layers-devel`: Installs the standard validation layers and required SPIR-V tools. These are crucial when debugging Vulkan applications, and we'll discuss them in the upcoming chapter.
+* `sudo apt install vulkan-validationlayers spirv-tools` or `sudo dnf install mesa-vulkan-devel vulkan-validation-layers-devel`: Installs the standard validation layers and required SPIR-V tools. These are crucial when debugging Vulkan applications, and we'll discuss them in the upcoming chapter.
 
 On Arch Linux, you can run `sudo pacman -S vulkan-devel` to install all the
 required tools above.