Changes description of "righteous rage" (#4947)

* UtBS S3: change description of "righteous rage"

data/campaigns/Under_the_Burning_Suns/scenarios/03_Stirring_in_the_Night.cfg

@@ -685,7 +685,7 @@
                         id=berserk
                         name= _ "righteous rage"
                         name_inactive=""
-                        description= _ "Whether used offensively or defensively, this attack presses the engagement until one of the champions is slain, or 30 rounds of attacks have occurred."
+                        description= _ "If used offensively or defensively against champions Grak or Zur, this attack presses the engagement until one of the combatants is slain, or 30 rounds of attacks have occurred."
                         value=30
                         [filter_opponent]
                             id=Grak,Zur