TSG S01 Fix bug: Anyone to fort

Any unit can move to the River Fort and trigger the apperance of Sir Gerrick. Change Moreth's comment to indicate this.

data/campaigns/The_South_Guard/scenarios/01_Born_to_the_Banner.cfg

@@ -198,7 +198,7 @@
 
         [message]
             speaker=Moreth
-            message= _ "You should head to the river fort! Sir Gerrick will want to know that reinforcements have arrived!"
+            message= _ "Someone should head to the river fort! Sir Gerrick will want to know that reinforcements have arrived!"
         [/message]
 
         {HIGHLIGHT_IMAGE 13 10 items/gohere.png ()}