Update working-with-the-nuget-registry.md

[stprior]

The version number in he point on updating PackageReference doesn't match the PackageReference version in the example referred to.

Why:

Closes [issue link]

What's being changed:

Check off the following:

• I have reviewed my changes in staging (look for "Automatically generated comment" and click Modified to view your latest changes).
• For content changes, I have completed the self-review checklist.

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  • 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")

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

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Source	Preview	Production	What Changed
packages/working-with-a-github-packages-registry/working-with-the-nuget-registry.md	fpt ghec ghes@ 3.5 3.4 3.3 3.2 ghae	fpt ghec ghes@ 3.5 3.4 3.3 3.2 ghae

[janiceilene]

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

[vgrl]

🎉 Thanks, @stprior, ⚡ I'm going to add one more detail to your change to remove any remaining confusion about what parameters need to be replaced in this step, and then I'll go ahead and merge this PR.

[vgrl]

👍 Looks good in preview.

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