docs(behavior_velocity_stop_line_module): update document

[purewater0901]

Description

Update document of the behavior velocity stop line module

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

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Post-review checklist for the PR author

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (3113539) 14.92% compared to head (c1622df) 14.92%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4417   +/-   ##
=======================================
  Coverage   14.92%   14.92%           
=======================================
  Files        1515     1515           
  Lines      104511   104511           
  Branches    31773    31773           
=======================================
  Hits        15595    15595           
  Misses      71902    71902           
  Partials    17014    17014           

Flag	Coverage Δ		*Carryforward flag
differential	25.00% <ø> (?)
total	14.92% <ø> (ø)		Carriedforward from 3113539

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

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