Visualizer.draw_polygons examples wrong

[lyviva]

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Motivation

Examples are out of data, so update.

Modification

According to the latest 'Visualizer.draw_polygons', fix them.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Base: 78.66% // Head: 78.66% // No change to project coverage 👍

Coverage data is based on head (108a002) compared to base (fe26c65).
Patch has no changes to coverable lines.

❗ Current head 108a002 differs from pull request most recent head 58de421. Consider uploading reports for the commit 58de421 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #798   +/-   ##
=======================================
  Coverage   78.66%   78.66%           
=======================================
  Files         128      128           
  Lines        9348     9348           
  Branches     1848     1848           
=======================================
  Hits         7354     7354           
  Misses       1679     1679           
  Partials      315      315           

Flag	Coverage Δ
unittests	78.66% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmengine/visualization/visualizer.py	93.19% <ø> (ø)

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