add rn on improved shell connections (#931)

source/release-notes/v3.1-release-notes.rst

@@ -21,6 +21,7 @@ New Features
 - `Disabling uploads and downloads`_
 - `Custom Javascript files`_
 - `Updated Apache options`_
+- `Improved shell connections`
 - `aarch64/arm64 and ppc64le packages`_
 - `Amazon Linux 2023 packages`_
 - `Debian 12 packages`_
@@ -284,6 +285,13 @@ The second is to alllow for custom directives.  You can now supply
 :ref:`custom location directives <custom_location_directives>`
 and :ref:`custom virtual host directives <custom_vhost_directives>`.
 
+Improved shell connections
+..........................
+
+The shell app has been updated so that shell sessions can last longer.
+The app is better at keeping the connection alive, meaning users
+will maintain shell sessions for longer.
+
 aarch64/arm64 and ppc64le packages
 ..................................