Update en.txt

chuckthenerd · rlepigre · commit e26082d6c3be · 2025-12-28T08:38:12.000+01:00
typo fix:  optionnal -&gt; optional
diff --git a/missions/misc/01_cal_nostradamus/skip/en.txt b/missions/misc/01_cal_nostradamus/skip/en.txt
@@ -1,4 +1,4 @@
-This mission is optionnal. You can skip it and go to the next one with the
+This mission is optional. You can skip it and go to the next one with the
 command
 
   $ gsh skip
