Update object-detector.md

[DilwoarH]

Dear ml5 community,

I'm making a Pull Request(PR). Please see the details below.

This change fixes an error on the documentation.

Before

yolo.detect(video, (err, results) => {
  console.log(results); // Will output bounding boxes of detected objects
});

After

objectDetector.detect(video, (err, results) => {
  console.log(results); // Will output bounding boxes of detected objects
});

[bomanimc]

@DilwoarH thank you so much for this change! Going to merge this in now! (cc @joeyklee for visibility)

[joeyklee]

Excellent!
@bomanimc - usually for these cases if a contributor is not already on our contributors list, we add them in using the all-contributor's bot like so:

@all-contributors please add @DilwoarH for content

[allcontributors]

@joeyklee

I could not determine your intention.

Basic usage: @all-contributors please add @Someone for code, doc and infra

For other usages see the documentation

[joeyklee]

@all-contributors please add @DilwoarH for doc

[allcontributors]

@joeyklee

I've put up a pull request to add @DilwoarH! 🎉