Update row names for zuul status dashboard

Trivial change that updates the name of the rows for the zuul status
dashboard.  This is also to ensure our gate is working currently.

Change-Id: I68d8f40bee4ee9230d5abc3a4391eb66b2188d93
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

grafana/zuul-status.yaml

@@ -1,7 +1,7 @@
 dashboard:
   title: Zuul Status
   rows:
-    - title: Row1
+    - title: Single Stats
       height: 150px
       panels:
         - title: Check Pipeline
@@ -28,7 +28,7 @@ dashboard:
           targets:
             - target: stats.gauges.zuul.pipeline.post.current_changes
           type: singlestat
-    - title: Row2
+    - title: Graphs
       height: 250px
       panels:
         - title: Test Nodes