fix(behavior_path_planner): fix drivable area document

[purewater0901]

Description

Fix the document where I change the platuml to cpp

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[taikitanaka3]

LGTM

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (b72ca85) 12.75% compared to head (d9cde9f) 12.75%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3008   +/-   ##
=======================================
  Coverage   12.75%   12.75%           
=======================================
  Files        1218     1218           
  Lines       85978    85969    -9     
  Branches    24469    24469           
=======================================
  Hits        10965    10965           
+ Misses      63652    63643    -9     
  Partials    11361    11361           

Flag	Coverage Δ		*Carryforward flag
differential	5.62% <ø> (?)
total	12.75% <ø> (+<0.01%)	⬆️	Carriedforward from b72ca85

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

Impacted Files	Coverage Δ
...id_map/laserscan_based_occupancy_grid_map_node.hpp	0.00% <ø> (ø)
...id_map/laserscan_based_occupancy_grid_map_node.cpp	0.00% <ø> (ø)
...ud_based_occupancy_grid_map/occupancy_grid_map.cpp	0.00% <ø> (ø)
...d_map/pointcloud_based_occupancy_grid_map_node.cpp	0.00% <ø> (ø)

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