Provide more info about vk.xml path

README.md

@@ -23,15 +23,11 @@ A CLI-interface is provided to generate vk.zig from the [Vulkan XML registry](ht
 $ zig-out/bin/generator path/to/vk.xml output/path/to/vk.zig
 ```
 This reads the xml file, parses its contents, renders the Vulkan bindings, and formats file, before writing the result to the output path. While the intended usage of vulkan-zig is through direct generation from build.zig (see below), the CLI-interface can be used for one-off generation and vendoring the result.
-NOTE: you need to replace `path/to/vk.xml` with the spec path from whatever source you prefer, here are some example orderered from the most recommended:
-- Vulkan-Headers repo:
+NOTE: you need to replace `path/to/vk.xml` with the spec path from whatever source you prefer, here are some examples orderered from the most recommended:
+- Vulkan SDK, you need the package installed on your system with environment path setup but its the most stable option:
+    /share/vulkan/registry/vk.xml
+- Vulkan-Headers repo, doesn't require the Vulkan SDK in the build environment:
     https://github.com/KhronosGroup/Vulkan-Headers/blob/main/registry/vk.xml
-- Vulkan SDK (you need the package installed on your system with environment path setup):
-      Windows:
-          Powershell: ${env:VULKAN_SDK}/share/vulkan/registry
-          Cmd: %VULKAN_SDL%/share/vulkan/registry
-      Linux:
-          /usr/share/vulkan/registry/vk.xml
 - local vk.xml inside examples:
     vulkan-zig\examples\vk.xml