Clean up wording in WebGPU/README.md

Author: MaxDesiatov

WebGPUDemo/README.md

@@ -9,7 +9,7 @@ the Swift SDK in the following command to the version that matches your installe
 swift package --swift-sdk swift-6.2-DEVELOPMENT-SNAPSHOT-2025-06-17-a_wasm js --use-cdn
 ```
 
-WebGPU requires a beta or technical preview version of Safari. For recent release versions make sure to enable
+WebGPU is enabled by default in beta and technical preview versions of Safari. Safari 17 and 18 require enabling
 WebGPU feature flag as shown on the screenshot:
 
 <img width="833" alt="Safari Feature Flags settings tab with WebGPU enabled" src="https://github.com/user-attachments/assets/7d0453ab-da51-4a6e-85da-dc466cf775be" />
@@ -20,5 +20,5 @@ Start a HTTP server with eg. `python3 -m http.server` or `npx serve`, then open
 http://localhost:8000 for `python3` or http://localhost:3000 for `npx serve` to view the Swift logo rendered using WebGPU.
 
 > [!NOTE]
-> If using an editor with SourceKit-LSP, make sure to update `.sourcekit-lsp/config.json` with the
+> When using an editor with SourceKit-LSP, update `.sourcekit-lsp/config.json` with the
 > Swift SDK used in your build command.