What's new and release notes documentation updates

The what's new and OS-specific release notes pages are now updated to provide better visibility and access to new features, improvements, and fixes:- The what's new page (this page) is now named New features in Microsoft Defender for Endpoint and includes both features and links to latest release notes.- The Release notes page now consolidates release details for all supported operating systems, including Windows Antivirus. The new page groups updates by platform and date, making it easier to find specific information.- All previous release notes pages redirect to the consolidated release notes page.