update screenshot

Author: ceorourke

docs/product/alerts/create-alerts/img/dynamic-threshold.png

@@ -137,9 +137,7 @@ Dynamic alerts can be used when you don't know what threshold to set, but you kn
 
 Dynamic alerts do not use the Critical, Warning, and Resolved thresholds like other alert threshold types as you are not setting these yourself. When no more anomalies are detected, the alert will resolve.
 
-TODO update this image when deploy is finished
-
-![When the percent change option is selected.](./img/percent-change.png)
+![When the dynamic threshold is selected.](./img/dynamic-threshold.png)
 
 ### Set Threshold to Trigger Alert