Remove non existing example links from dcgan.md

[adrianfiedler]

The links to the "LatentVector" example do not exist. Only "RandomWalk", "Slider" and "Random".

Dear ml5 community,

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

A good PR 🌟

→ Step 1: Describe your Pull Request 📝

Fixing a Bug? Adding an Update? Submitting a New Feature? Does it introduce a breaking change?
The links to the "LatentVector" example do not exist. Only "RandomWalk", "Slider" and "Random".
So I removed them.

A great PR 🌟🌟

→ Step 2: Share a Relevant Example 🦄

Here's some example code or a demonstration of my feature as a part of this pull request, a separate pull request, in the https://editor.p5js.org, or codepen/jsfiddle/etc...

The best PR 🌟🌟🌟

→ Step 3: Screenshots or Relevant Documentation 🖼

Here's some helpful screenshots and/or documentation of the new feature

[lindapaiste]

Thanks for these changes! It looks like we don't have plain javascript versions of the two LatentVector_ examples either.

[lindapaiste]

@all-contributors please add @adrianfiedler for docs

[allcontributors]

@lindapaiste

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