docs(pose_initializer): fix README and json schema default value

[KYabuuchi]

Description

• Removed conventional parameter table in README.md.
• Removed \n in array of JSON schema.

Tests performed

• I have confirmed that JSON validation pass well.

cd autoware/src/universe/autoware.universe/localization
find -wholename '*/schema/*.schema.json' -printf '%p: ' -execdir bash -c 'check-jsonschema --schemafile "$1" ../config/"${1:2:-12}"*.param.yaml' bash '{}' +

• Documentation is fixed

before

after

Effects on system behavior

Does not affect.

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[github-actions]

Documentation URL: https://autowarefoundation.github.io/autoware.universe/pr-6342/
Modified URLs:

• https://autowarefoundation.github.io/autoware.universe/pr-6342/localization/pose_initializer/

[KYabuuchi]

The depoly-docs are falling because of this PR #6444
I will fix it by another PR.

[KYabuuchi]

#6465 will fix the deploy-docs failling.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9120c08) 15.10% compared to head (2b91196) 15.10%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6342   +/-   ##
=======================================
  Coverage   15.10%   15.10%           
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  Files        1823     1823           
  Lines      126292   126292           
  Branches    38188    38188           
=======================================
  Hits        19077    19077           
  Misses      85825    85825           
  Partials    21390    21390           

Flag	Coverage Δ		*Carryforward flag
differential	7.56% <ø> (?)
total	15.10% <ø> (ø)		Carriedforward from 9120c08

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