docs(planning design): update high level design

[TakaHoribe]

Description

Pre-review checklist for the PR author

The PR author must check the checkboxes below when creating the PR.

• I've confirmed the contribution guidelines.
• The PR follows the pull request guidelines.

In-review checklist for the PR reviewers

The Reviewers must check the checkboxes below before approval.

• The PR follows the pull request guidelines.

Post-review checklist for the PR author

The PR author must check the checkboxes below before merging.

• There are no open discussions or they are tracked via tickets.

After all checkboxes are checked, anyone who has write access can merge the PR.

[github-actions]

Documentation URL: https://autowarefoundation.github.io/autoware-documentation/pr-401/
Modified URLs:

• https://autowarefoundation.github.io/autoware-documentation/pr-401/design/autoware-architecture/planning/index-japanese/
• https://autowarefoundation.github.io/autoware-documentation/pr-401/design/autoware-architecture/planning/

[stale]

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