remove default values in .env.example

Author: Deepthi-Chand

.env.example

@@ -1,13 +1,13 @@
 DB_ENGINE=django.db.backends.postgresql
 DB_NAME=postgres
-DB_USER=postgres
-DB_PASSWORD=postgres
+DB_USER=postgresuser
+DB_PASSWORD=postgrespassword
 DB_HOST=backend_db
 DB_PORT=5432
 TELEMETRY_URL=http://otel-collector:4317
 ELASTICSEARCH_INDEX=http://elasticsearch:9200
-ELASTICSEARCH_USERNAME=elastic
-ELASTICSEARCH_PASS=changeme
+ELASTICSEARCH_USERNAME=elasticuser
+ELASTICSEARCH_PASS=elasticpass
 URL_WHITELIST=http://localhost:8000,http://localhost,http://localhost:3000
 DEBUG=True
 SECRET_KEY=your-secret-key