ci: update release template (#27901)

Author: bartlomieju

tools/release/release_doc_template.md

@@ -122,7 +122,7 @@ verify on GitHub that everything looks correct.
 - ⛔ Verify that:
   - [ ] There are 24 assets on the
         [GitHub release draft](https://github.com/denoland/deno/releases/v$VERSION).
-  - [ ] There are 10 zip files for this version on
+  - [ ] There are 20 zip files for this version on
         [dl.deno.land](https://console.cloud.google.com/storage/browser/dl.deno.land/release/v$VERSION).
 
 - [ ] Publish the release on Github