fix: remove quotation mark

config/prometheus.yml

@@ -12,14 +12,14 @@ alerting:
 
 # Load rules once and periodically evaluate them according to the global evaluation_interval.
 rule_files:
-  - "instance-down-rules.yml"
-# - "first_rules.yml"
-# - "second_rules.yml"
+  - instance-down-rules.yml
+# - first_rules.yml
+# - second_rules.yml
 
 # A scrape configuration containing exactly one endpoint to scrape:
 # Here it's Prometheus itself.
 scrape_configs:
-  # The job name is added as a label "job=job_name"" to any timeseries scraped from this config.
+  # The job name is added as a label "job=job_name" to any timeseries scraped from this config.
   # Monitored information captured by prometheus
 
   # prometheus fetches application services