make sentence feel more complete

Author: tshepang

src/tests/ci.md

@@ -463,7 +463,7 @@ These are some useful panels from the dashboard:
 - Pipeline duration: check how long the auto builds take to run.
 - Top slowest jobs: check which jobs are taking the longest to run.
 - Change in median job duration: check what jobs are slowest than before.
-  Useful to detect regressions.
+  This is useful for detecting regressions.
 - Top failed jobs: check which jobs are failing the most.
 
 To learn more about the dashboard, see the [Datadog CI docs].