fix(velodyne_monitor): add 20 to temp_hot_***

[h-ohta]

Description

• add 20 to temp_hot_*** to set back previous value.This is because VLP-32C has higher temperature than operational while working in the indoor enivronment.
• update README

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[tkimura4]

LGTM

[ito-san]

LGTM

[codecov]

Codecov Report

Merging #1744 (18ec6e3) into main (4b8cf17) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main    #1744   +/-   ##
=======================================
  Coverage   10.29%   10.29%           
=======================================
  Files        1202     1202           
  Lines       86711    86711           
  Branches    20054    20054           
=======================================
  Hits         8930     8930           
  Misses      68485    68485           
  Partials     9296     9296           

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	10.28% <0.00%> (ø)		Carriedforward from 4b8cf17

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

Impacted Files	Coverage Δ
.../src/goal_pose_visualizer/goal_pose_visualizer.cpp	0.00% <0.00%> (ø)
...on_planner/src/mission_planner/mission_planner.cpp	0.00% <0.00%> (ø)
...sion_planner_lanelet2/mission_planner_lanelet2.cpp	0.00% <0.00%> (ø)
...src/mission_planner_lanelet2/utility_functions.cpp	0.00% <0.00%> (ø)
...src/mission_planner_lanelet2/utility_functions.hpp	0.00% <ø> (ø)

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[yn-mrse]

Can you please provide the background of the 20 degree higher setting in the description section of this PR?
It is preferable to include this information in the README if possible, but at a minimum, the description in the PR will ensure traceability.

[h-ohta]

@yn-mrse I fixed PR comment to explain the reason.