docs(ad-api): change fail-safe api

[isamu-takagi]

Signed-off-by: Takagi, Isamu isamu.takagi@tier4.jp

Description

Change the fail-safe API to support multiple behaviors of MRM.

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[github-actions]

Documentation URL: https://autowarefoundation.github.io/autoware-documentation/pr-165/
Modified URLs:

• https://autowarefoundation.github.io/autoware-documentation/pr-165/design/autoware-interfaces/ad-api/list/api/fail_safe/
• https://autowarefoundation.github.io/autoware-documentation/pr-165/design/autoware-interfaces/ad-api/list/api/fail_safe/mrm_state/
• https://autowarefoundation.github.io/autoware-documentation/pr-165/design/autoware-interfaces/ad-api/list/api/fail_safe/state/
• https://autowarefoundation.github.io/autoware-documentation/pr-165/design/autoware-interfaces/ad-api/types/autoware_ad_api_msgs/msg/fail_safe_state/
• https://autowarefoundation.github.io/autoware-documentation/pr-165/design/autoware-interfaces/ad-api/types/autoware_ad_api_msgs/msg/mrm_state/