docs: Minor formatting fix

Google APIs · copybara-github · commit 5b3202b5ef0a · 2023-08-23T10:40:13.000-07:00
PiperOrigin-RevId: 559474510
diff --git a/google/cloud/optimization/v1/fleet_routing.proto b/google/cloud/optimization/v1/fleet_routing.proto
@@ -2301,11 +2301,9 @@ message AggregatedMetrics {
 
   // The total duration should be equal to the sum of all durations above.
   // 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]
-  // ```
   google.protobuf.Duration total_duration = 7;
 
   // Total travel distance for a route or a solution.
