docs: Minor formatting

Google APIs · copybara-github · commit ba5bae4f305a · 2023-08-16T09:47:27.000-07:00
PiperOrigin-RevId: 557516220
diff --git a/google/cloud/optimization/v1/fleet_routing.proto b/google/cloud/optimization/v1/fleet_routing.proto
@@ -2300,10 +2300,12 @@ message AggregatedMetrics {
   google.protobuf.Duration visit_duration = 6;
 
   // The total duration should be equal to the sum of all durations above.
-  // For routes, it also corresponds to
+  // For routes, it also corresponds to:
+  // ```
   // [ShipmentRoute.vehicle_end_time][google.cloud.optimization.v1.ShipmentRoute.vehicle_end_time]
   // -
-  // [ShipmentRoute.vehicle_start_time][google.cloud.optimization.v1.ShipmentRoute.vehicle_start_time].
+  // [ShipmentRoute.vehicle_start_time][google.cloud.optimization.v1.ShipmentRoute.vehicle_start_time]
+  // ```
   google.protobuf.Duration total_duration = 7;
 
   // Total travel distance for a route or a solution.
