[SDK-4760] Update Unity docs around release assets

[hokstuff]

Pull Request/Issue Resolution

Description of Change:

I'm changing..... (could be a link, a new image, a new section, etc.)... because...

As of 4.0.0, our Unity release assets no longer have a Appboy-nodeps.unitypackage because instead you'd download Appboy.unitypackage. If you want to import SDWebImage, you can toggle in the Unity UI to opt-in and import SDWebImage

(You can compare the current 3 assets attached to the release vs the 4 assets in 3.x and before)

https://jira.braze.com/browse/SDK-4760

Is this change associated with a Braze feature/product release?

• Yes (Insert Feature Release Date Here)
• No

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✔️ Pull Request Checklist

• Check that you haven't removed any images (replacing an image with an updated one of the same name is fine), as this breaks the French site
• Check that all links work.
• Ensure you have completed our Contributors License Agreement.
• Tag @josh-mccrowell-braze and @internetisaiah as a reviewer when your work is done and ready to be reviewed for merge. Are you an internal product manager? Reference the internal reviewing chart to tag the appropriate reviewer.
• If the documentation involves a 1) paid SKU, 2) a third party, 3) SMS, 4) AI, or 5) privacy, ensure that Maria Maldonado on the Legal team has signed off.
• Tag others as reviewers as necessary.
• If you have modified any links, be sure to add redirects to assets > js > broken_redirect_list.js

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[hokstuff]

Question for docs team: What is the process for updating the complementary French docs (or other languages)?

[josh-mccrowell-braze]

@hokstuff Good question about the French docs! The Localization team has downstream workflows. We don't need to/shouldn't update the French docs, as it will be handled separately.

[josh-mccrowell-braze]

Hey hey @hokstuff : This looks good on my end. Are these changes ready to be rolled out?

[hokstuff]

@josh-mccrowell-braze Yes it is ready to be merged and released!