doc: fix maintaining ICU guide

PR-URL: #36980
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: targos

doc/guides/maintaining-icu.md

@@ -158,7 +158,7 @@ process.versions.icu;
 new Intl.DateTimeFormat('es', { month: 'long' }).format(new Date(9E8));
 ```
 
-(This should print your updated ICU version number, and also `January` again.)
+(This should print your updated ICU version number, and also `enero` again.)
 
 You are ready to check in the updated `deps/icu-small`. This is a big commit,
 so make this a separate commit from the smaller changes.