docs: Minor formatting (#146)

* docs: Minor formatting

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packages/google-cloud-optimization/google/cloud/optimization_v1/types/fleet_routing.py

@@ -3645,9 +3645,14 @@ class AggregatedMetrics(proto.Message):
             Total visit duration for a route or a
             solution.
         total_duration (google.protobuf.duration_pb2.Duration):
-            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]
+            The total duration should be equal to the sum of all
+            durations above. For routes, it also corresponds to:
 
-            [ShipmentRoute.vehicle_start_time][google.cloud.optimization.v1.ShipmentRoute.vehicle_start_time].
+            ::
+
+               [ShipmentRoute.vehicle_end_time][google.cloud.optimization.v1.ShipmentRoute.vehicle_end_time]
+               -
+               [ShipmentRoute.vehicle_start_time][google.cloud.optimization.v1.ShipmentRoute.vehicle_start_time]
         travel_distance_meters (float):
             Total travel distance for a route or a
             solution.