docs(behavior_path_goal_planner): fix typo tha -> the

[h-ohta]

Description

fix typo tha -> the

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0d10e81) 14.91% compared to head (6d2c7dd) 14.91%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6303   +/-   ##
=======================================
  Coverage   14.91%   14.91%           
=======================================
  Files        1817     1817           
  Lines      125357   125357           
  Branches    37640    37640           
=======================================
  Hits        18697    18697           
  Misses      85651    85651           
  Partials    21009    21009           

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	14.91% <ø> (ø)		Carriedforward from 0d10e81

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