fix: misspelling in 2025-11-30_nixos-25.11 release notes (#1906)

Co-authored-by: Nicholas Sidwell <[email protected]>

Author: euphemism

core/src/content/blog/announcements/2025-11-30_nixos-25.11.md

@@ -45,7 +45,7 @@ This release of NixOS
 
 ### GNOME 49
 
-GNOME has been updated to version 49 "Brescia", which removes X11 session support, introduces a new video player, a new document viewer, a redesigned calender and more changes. Refer to the [release notes](https://release.gnome.org/49) for more details.
+GNOME has been updated to version 49 "Brescia", which removes X11 session support, introduces a new video player, a new document viewer, a redesigned calendar and more changes. Refer to the [release notes](https://release.gnome.org/49) for more details.
 
 ### C compilers