docs(raw_vehicle_cmd_converter): update readme

[TakaHoribe]

Description

Update readme for the accel-brake-map used in the raw_vehicle_cmd_converter

Tests performed

None

Effects on system behavior

None

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[github-actions]

Documentation URL: https://autowarefoundation.github.io/autoware.universe/pr-5822/
Modified URLs:

• https://autowarefoundation.github.io/autoware.universe/pr-5822/vehicle/raw_vehicle_cmd_converter/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (765a596) 15.32% compared to head (d7ee435) 10.52%.
Report is 181 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5822       +/-   ##
===========================================
- Coverage   15.32%   10.52%    -4.81%     
===========================================
  Files        1721       14     -1707     
  Lines      118559     1416   -117143     
  Branches    37995      166    -37829     
===========================================
- Hits        18169      149    -18020     
+ Misses      79657     1126    -78531     
+ Partials    20733      141    -20592     

Flag	Coverage Δ
differential	10.52% <ø> (?)
total	?

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[taikitanaka3]

LGTM