Update 3.0.0 release notes for native packaging

Include a specific section with the improvements and changes
in the native packages.

Change-Id: Iedb64073bd8ea979411c23b595a869a2dacda980
diff --git a/pages/site/releases/3.0.md b/pages/site/releases/3.0.md
index 6d828ea..068c312 100644
--- a/pages/site/releases/3.0.md
+++ b/pages/site/releases/3.0.md
@@ -106,3 +106,21 @@
 * Upgrade soy to 2019-03-11
 
 * Upgrade truth to 0.43
+
+## Native packaging
+
+* Upgrade the Docker/Ubuntu image to Ubuntu 18.04
+
+* Upgrade the Docker/CentOS image to CentOS 7.6.1810
+
+* RPM/Deb: Remove Gerrit service start upon package setup.
+
+  Gerrit service is no longer started automatically after the package installation,
+  but requires manual invocation of the `/etc/init.d/gerrit start` command, or
+  the configuration of the service for auto-start and the reboot of the machine.
+
+* Docker: auto-init the Gerrit site during first start of the container.
+
+  Simplify the configuration and management of Docker setups by automatically
+  detecting if a `$GERRIT_SITE/git/All-Projects.git` exists and, if it doesn't,
+  invoke the Gerrit init step in batch mode.