Apply recent changes from Vulkan Tutorial

Author: SaschaWillems

en/02_Development_environment.adoc

@@ -189,8 +189,7 @@ The most important components you'll need for developing Vulkan applications on
 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.
 
@@ -233,7 +232,7 @@ or
 
 [,bash]
 ----
-sudo pacman -S glfw-wayland # glfw-x11 for X11 users
+sudo pacman -S glfw
 ----
 
 === GLM

en/03_Drawing_a_triangle/02_Graphics_pipeline_basics/02_Fixed_functions.adoc

@@ -164,7 +164,7 @@ viewportState.scissorCount = 1;
 viewportState.pScissors = &scissor;
 ----
 
-Independent of how you set them, it's is possible to use multiple viewports and scissor rectangles on some graphics cards, so the structure members reference an array of them.
+Independent of how you set them, it's possible to use multiple viewports and scissor rectangles on some graphics cards, so the structure members reference an array of them.
 Using multiple requires enabling a GPU feature (see logical device creation).
 
 == Rasterizer