docs(behavior_velocity): fix link error (tier4#1065)

Signed-off-by: Tomohito Ando <tomohito.ando@tier4.jp>

planning/behavior_velocity_planner/run-out-design.md

@@ -80,7 +80,7 @@ Abstracted obstacle data has following information.
 | min_velocity_mps | `float`                                                                 | minimum velocity of the obstacle. specified by parameter of `dynamic_obstacle.min_vel_kmph`                            |
 | max_velocity_mps | `float`                                                                 | maximum velocity of the obstacle. specified by parameter of `dynamic_obstacle.max_vel_kmph`                            |
 
-Enter the maximum/minimum velocity of the object as a parameter, adding enough margin to the expected velocity. This parameter is used to create polygons for [collision detection](#Collision-detection).
+Enter the maximum/minimum velocity of the object as a parameter, adding enough margin to the expected velocity. This parameter is used to create polygons for [collision detection](./run-out-design.md#Collision-detection).
 
 Future work: Determine the maximum/minimum velocity from the estimated velocity with covariance of the object
 
@@ -114,7 +114,7 @@ You can choose whether to use this feature by parameter of `use_partition_lanele
 
 Along the ego vehicle path, determine the points where collision detection is to be performed for each `detection_span`.
 
-The travel times to the each points are calculated from [the expected target velocity](#Calculate-the-expected-target-velocity-for-ego-vehicle).
+The travel times to the each points are calculated from [the expected target velocity](./run-out-design.md#Calculate-the-expected-target-velocity-for-ego-vehicle).
 
 ![brief](./docs/run_out/create_polygon_on_path_point.svg)