Fix scripts, README and examples

examples/symfony-postgres.yml

@@ -1,7 +1,8 @@
+# GitHub Action for Symfony with PostgreSQL
 name: Testing Symfony with PostgreSQL
 on: [push, pull_request]
 jobs:
-  laravel:
+  symfony:
     name: Symfony (PHP ${{ matrix.php-versions }})
     runs-on: ubuntu-latest
     services: