Merge pull request #12026 from nextcloud/nc30/basenames

feat(admin): Add information about `forbidden_filename_basenames` in Nextcloud 30

admin_manual/release_notes/upgrade_to_30.rst

@@ -16,4 +16,5 @@ Changes to the available options in ``config.php``.
 
 * The option ``blacklisted_files`` is now deprecated and replaced with ``forbidden_filenames``
 * The option ``forbidden_chars`` is now deprecated and replaced with ``forbidden_filename_characters``
+* The option ``forbidden_filename_basenames`` was added to allow bocking files with specific basenames (the filename without extension (before the first dot))
 * The option ``forbidden_filename_extensions`` was added to allow blocking extensions from being used on filenames