minor tweak

Author: edmundhung

src/content/docs/workers/testing/vitest-integration/debugging.mdx

@@ -80,4 +80,4 @@ To setup VS Code for breakpoint debugging in your Worker tests, create a `.vscod
 }
 ```
 
-Select **Debug Workers tests** at the top of the **Run & Debug** panel to open inspector with Vitest and attach a debugger to the Workers runtime. Then you can add breakpoints to your test files and start debugging.
+Select **Debug Workers tests** at the top of the **Run & Debug** panel to open an inspector with Vitest and attach a debugger to the Workers runtime. Then you can add breakpoints to your test files and start debugging.