docs: Correct typo in UPGRADE-6.0.md (#334)

Z4ck404 · web-flow · commit 973666e8ce9c · 2022-10-26T11:58:29.000-04:00
diff --git a/UPGRADE-6.0.md b/UPGRADE-6.0.md
@@ -165,7 +165,7 @@ module "cluster_after" {
       instance_class          = "db.r5.large"
       instance_promotion_tier = 15
     }
-  ]
+  }
 
   + autoscaling_enabled      = true
   + autoscaling_min_capacity = 1
