feat(obstacle_cruise_planner): add explanations for holding the closest stop obstacle

[purewater0901]

Signed-off-by: yutaka purewater0901@gmail.com

Description

Update readme to add the explanations about how to keep the closest stop obstacle in the target obstacles.

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[github-actions]

Documentation URL: https://autowarefoundation.github.io/autoware.universe/pr-1835/
Modified URLs:

• https://autowarefoundation.github.io/autoware.universe/pr-1835/planning/obstacle_cruise_planner/

[codecov]

Codecov Report

Merging #1835 (1336d55) into main (cb2552b) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main    #1835   +/-   ##
=======================================
  Coverage   10.44%   10.44%           
=======================================
  Files        1221     1221           
  Lines       87728    87728           
  Branches    20493    20493           
=======================================
  Hits         9160     9160           
  Misses      69091    69091           
  Partials     9477     9477           

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	10.42% <0.00%> (ø)		Carriedforward from cb2552b

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

Impacted Files	Coverage Δ
...include/behavior_velocity_planner/planner_data.hpp	0.00% <0.00%> (ø)
planning/behavior_velocity_planner/src/node.cpp	0.42% <0.00%> (ø)

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[takayuki5168]

LGTM