fix(influxdb3): Remove redundant heading and expand the children tag

Author: jstirnaman

content/shared/influxdb3-internals-reference/_index.md

@@ -1,5 +1,5 @@
-# InfluxDB 3 Internals
 
-This section provides in-depth technical documentation about {{% product-name %}} internal systems and architecture. Understanding these internals can help with performance optimization, troubleshooting, and advanced integrations.
+Learn about {{% product-name %}} internal systems and architecture.
+Understanding these internals can help with performance optimization, troubleshooting, and advanced integrations.
 
-{{< children >}}
+{{< children readmore=true hr=true hlevel="h2" >}}