docs Arena.jl plotPointClouds example

[dehann]

requires:

• JuliaRobotics/Arena.jl#119

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (3934f85) 27.63% compared to head (1a3764a) 27.63%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1011 +/- ## ======================================= Coverage 27.63% 27.63% ======================================= Files 54 54 Lines 2580 2580 ======================================= Hits 713 713 Misses 1867 1867 ```

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