Change the deprecation note to use past tense

[CyberFlameGO]

Why:

Closes #9384

What's being changed:

The tense of the deprecation note in the article

Check off the following:

• I have reviewed my changes in staging (look for the latest deployment event in your pull request's timeline, then click View deployment).
• For content changes, I have completed the self-review checklist.

Writer impact (This section is for GitHub staff members only):

• This pull request impacts the contribution experience
  • I have added the 'writer impact' label
  • I have added a description and/or a video demo of the changes below (e.g. a "before and after video")

[CyberFlameGO]

I feel like this article should actually be removed soon, though the button still exists as depicted in this screenshot:

[ramyaparimi]

@CyberFlameGO
Thanks so much for opening a PR! I'll get this triaged for review ⚡

[mchammer01]

@CyberFlameGO - good spot, LGTM ✨
(and yes, the button and section should be removed from the UI)

[github-actions]

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