[DOC] Bug in Plugins Placements JS-Example

[wayofsamu]

What changes are proposed in this pull request?

Fixed a small bug/ copy-paste mistake in the plugin docs.

Do you prefer small PRs like this, or should I write issues for stuff like this instead?

What areas of FiftyOne does this PR affect?

• App: FiftyOne application changes
• Build: Build and test infrastructure changes
• Core: Core fiftyone Python library changes
• Documentation: FiftyOne documentation changes
• Other

[benjaminpkane]

Thanks @Sa-Schmi. Pardon the delay. Small PRs are welcome if it improves readability. I see in this case you were aiming for improving consistency. Also welcomed. Note that plugin documentation will probably be improved internally in the coming months. Thanks!

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.10% 🎉

Comparison is base (f3921aa) 15.91% compared to head (0e1065a) 16.01%.
Report is 234 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3364      +/-   ##
===========================================
+ Coverage    15.91%   16.01%   +0.10%     
===========================================
  Files          572      572              
  Lines        70525    71155     +630     
  Branches       741      800      +59     
===========================================
+ Hits         11222    11397     +175     
- Misses       59303    59758     +455     

Flag	Coverage Δ
app	16.01% <ø> (+0.10%)	⬆️

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see 115 files with indirect coverage changes

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