docs(recipes/swc): use app-specific tsconfig

Update example to use app-specific tsconfig. Using the root tsconfig
will include `*.dto.ts` (etc) from all apps, whereas they might not all
expose HTTP endpoints or publish a swagger doc.

Author: rickdgeerling

content/recipes/swc.md

@@ -142,7 +142,7 @@ generator.generate({
   visitors: [new ReadonlyVisitor({ introspectComments: true, pathToSource: __dirname })],
   outputDir: __dirname,
   watch: true,
-  tsconfigPath: 'tsconfig.build.json',
+  tsconfigPath: 'apps/<name>/tsconfig.app.json',
 });
 ```