message: docs(sitemap): fixed the sitemap for docs
diff: <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  {%- for url in doc.urls %}
  <url>
  - <loc>https://angular.io/{$ url $}</loc>
  + <loc>https://rxjs-dev.firebaseapp.com/{$ url $}</loc>
  </url>{% endfor %}
  </urlset>
  \ No newline at end of file
  