Update mediator.mdx

Author: aritchie

src/content/docs/release-notes/mediator.mdx

@@ -9,6 +9,7 @@ import RN from '/src/components/ReleaseNote.astro';
 <RN type="feature" breaking={true}>Moving to .NET 8 & 10 as minimum target</RN>
 <RN type="feature" breaking={true}>New HTTP Client Source Generation now generates handlers, contracts, JSON converters, and registration to make it fully compatible.  This will require you to call a new registration method, but its setup through MediatorHttpItem remains the same</RN>
 <RN type="feature" breaking={true}>DirectHttpRequest is gone.  You can create your own HTTP objects as before which will source generate a handler</RN>
+<RN type="enhancement">New PublishToBackground on IMediator and IMediatorContext intended to fix scoping issues that can occur on aspnet fire & forget scenarios.  This new method spawns a new child scope so you can continue to run without worrying about disposal.  Note that you can still use Publish to await all event completions using the same service scope</RN>
 <RN type="enhancement">The HTTP Client source generation no longer ignores missing OperationIDs.  It inferes the contact name using the HTTP verb and path info (ie. GET /user/list = GetUserList)</RN>
 <RN type="enhancement">ASPNET no longer enforces operation ID in the attribute setup</RN>
 <RN type="enhancement">We now support async enumerable responses.  Sample below:</RN>