Fix systemctl command for ruby path

ruby_on_rails/advanced_forms_and_activerecord/installing_psql.md

@@ -76,7 +76,7 @@ sudo apt install postgresql postgresql-contrib libpq-dev
 After installation is complete, let's start the server using this command:
 
 ```bash
-sudo systemctl start postgresql.service
+sudo systemctl start postgresql.service && systemctl status postgresql.service
 ```
 
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