Updates the Unity SDK docs with new SetData methods on spans & transa…

[lukemun]

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Updates the Unity SDK docs with new SetData methods on spans & transactions

SDK changes: getsentry/sentry-dotnet#3936

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Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

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Name	Status	Preview	Comments	Updated (UTC)
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[bruno-garcia]

Thank you Luke!! Some small notes but generally lgtm.

I'll leave it out to @Flash0ver to do the final 🟢

[Flash0ver]

Thanks @lukemun for improving our Unity docs.
Thank you very much indeed. You may have revealed a bug in our .NET SDK.

I also left some notes.
Please mind: I made a "trailing-space-removing" push to the PR in order to kick off the preview deployment.

[Flash0ver]

@getsentry/docs Am I allowed to approve and run the required workflows, or is this something that the docs owners should do?

@lukemun I kicked off another sentry-docs Preview. Thanks for the changes.

[coolguyzone]

Hey @Flash0ver , you need certain Vercel permissions to run the builds, if you have those perms, feel free to do so. I went ahead and kicked them off for this PR.