Update Terrains.json

Author: EmperorPinguin

android/assets/jsons/Civ V - Vanilla/Terrains.json

@@ -188,7 +188,7 @@
 		"occursOn": ["Tundra","Plains","Grassland","Hill"],
 		"uniques": [
 			"Rough terrain", "Vegetation",
-			"Provides a one-time Production bonus to the closest city when cut down",
+			"Provides a one-time bonus of [30] Production to the closest city when cut down",
 			"Blocks line-of-sight from tiles at same elevation",
 			"[25]% Chance to be destroyed by nukes",
 			"A Region is formed with at least [30]% [Forest] tiles, with priority [3]",