Comment out Kamal WEB_CONCURRENCY config, since it already defaults to 1

Author: jeromedalbert

railties/lib/rails/generators/rails/app/templates/config/deploy.yml.tt

@@ -28,10 +28,10 @@ registry:
 env:
   secret:
     - RAILS_MASTER_KEY
-  clear:
+  # clear:
     # Set this to the number of cores you wish the application to use on each server.
     # You can use "auto" and the app will attempt to use all available cores (but may guess wrong on some cloud hosts!)
-    WEB_CONCURRENCY: 1
+    # WEB_CONCURRENCY: 2
 
     # Match this to the database server to configure Active Record correctly
     # DB_HOST: 192.168.0.2