Add a description for the MySQL Example

Signed-off-by: Pete Wall <pete.wall@grafana.com>

Author: petewall

charts/k8s-monitoring/docs/examples/features/integrations/mysql/README.md

@@ -2,7 +2,11 @@
 (NOTE: Do not edit README.md directly. It is a generated file!)
 (      To make changes, please modify values.yaml or description.txt and run `make examples`)
 -->
-# Example: features/integrations/mysql/values.yaml
+# MySQL Integration
+
+This example shows how to load two MySQL integration instances, which utilize Alloy's [prometheus.exporter.mysql](https://grafana.com/docs/alloy/latest/reference/components/prometheus/prometheus.exporter.mysql/) component
+to scrape metrics from the MySQL database. It also modifies the Pod Logs feature to add special log handling for MySQL
+pods. The username and password for the `prod-db` example are stored in a Kubernetes secret.
 
 ## Values