timeshift: fix meta.longDescription (the wrapper part)

Author: ShamrockLee

pkgs/applications/backup/timeshift/default.nix

@@ -25,8 +25,8 @@ in
   meta = oldAttrs.meta // {
     description = oldAttrs.meta.description;
     longDescription = oldAttrs.meta.longDescription + ''
-      This package comes with runtime dependencies of command utilities provided by rsync, coreutils, mount, umount, psmisc, cron and (optionally) btrfs.
-      If you want to use the commands provided by the system, override the propagatedBuildInputs or use timeshift-minimal instead
+      This package comes with runtime dependencies of command utilities provided by rsync, coreutils, mount, umount, psmisc, cron and btrfs.
+      If you want to use the commands provided by the system, use timeshift-minimal instead.
     '';
   };
 })