Updates release notes

Author: milanholemans

docs/docs/about/release-notes.mdx

@@ -10,6 +10,7 @@ sidebar_position: 3
 
 **SharePoint:**
 
+- [spo page publish](../cmd/spo/page/page-publish.mdx) - publishes a modern page [#6420](https://github.com/pnp/cli-microsoft365/issues/6420)
 - [spo tenant site membership list](../cmd/spo/tenant/tenant-site-membership-list.mdx) - retrieves information about default site groups' membership [#5980](https://github.com/pnp/cli-microsoft365/issues/5980)
 
 **SharePoint Premium:**