fix(behavior_path_planner): revise some content about avoidance in .md

[shulanbushangshu]

Description

This PR revises some content about avoidance in README.md and behavior_path_planner_avoidance-design.md

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[taikitanaka3]

@shulanbushangshu
you need doc: ~ for document PR

[github-actions]

Documentation URL: https://autowarefoundation.github.io/autoware.universe/pr-2261/
Modified URLs:

• https://autowarefoundation.github.io/autoware.universe/pr-2261/planning/behavior_path_planner/
• https://autowarefoundation.github.io/autoware.universe/pr-2261/planning/behavior_path_planner/behavior_path_planner_avoidance-design/

[codecov]

Codecov Report

Base: 11.12% // Head: 11.07% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (9e28cc9) compared to base (d3768c4).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2261      +/-   ##
==========================================
- Coverage   11.12%   11.07%   -0.06%     
==========================================
  Files        1200     1200              
  Lines       86198    86609     +411     
  Branches    20793    21037     +244     
==========================================
  Hits         9593     9593              
- Misses      66479    66873     +394     
- Partials    10126    10143      +17     

Flag	Coverage Δ		*Carryforward flag
differential	3.59% <ø> (?)
total	11.10% <ø> (ø)		Carriedforward from d3768c4

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
planning/behavior_path_planner/src/utilities.cpp	3.42% <0.00%> (-0.42%)	⬇️
...ner/src/scene_module/pull_over/shift_pull_over.cpp	0.00% <0.00%> (ø)
...er/src/scene_module/pull_over/pull_over_module.cpp	0.00% <0.00%> (ø)
.../scene_module/utils/geometric_parallel_parking.cpp	0.00% <0.00%> (ø)

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[satoshi-ota]

Thanks for your PR. LGTM 👍

[stale]

This pull request has been automatically marked as stale because it has not had recent activity.