Fix ignored file path (#41747)

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packages/next/lib/typescript/writeVscodeConfigurations.ts

@@ -45,6 +45,6 @@ export async function writeVscodeConfigurations(
       await fs.writeFile(gitIgnore, `${gitIgnoreContent}\n.vscode\n`)
     }
   } catch (e) {
-    await fs.writeFile(gitIgnore, `vscode\n`)
+    await fs.writeFile(gitIgnore, `.vscode\n`)
   }
 }