Fixed matrix.dotnet-version key

[weineran]

Changed matrix.dotnet key to matrix.dotnet-version

Why:

There was a small bug in the docs.

What's being changed:

Changed matrix.dotnet key to matrix.dotnet-version

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.

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")

[welcome]

Thanks for opening this pull request! A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[ramyaparimi]

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

[weineran]

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

@ramyaparimi No problem! It's a super short review, but let me know if there are any questions/comments/concerns.

[lucascosti]

Thanks a lot for this fix, @weineran! I'll get this merged 🚀

[github-actions]

Thanks very much for contributing! Your pull request has been merged 🎉 You should see your changes appear on the site in approximately 24 hours. If you're looking for your next contribution, check out our help wanted issues ⚡