fix: Fixed typo in upgrade-instructions.md

[adrian-niculescu]

Fixed typo

PR Checklist

• [x ] The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• [x ] If there is an issue related with this PR, point it out here.

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[adrian-niculescu]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[avats-dev]

Hii @adrian-niculescu , this looks good. Although as your PR has just one commit, you need it to be a semantic commit to pass the checks. So I think there are two ways for avoiding this:

• either someone merges this with the failing checks, depends on the reviewers and maintainers.
• or you might add more commits (i.e. resolve more minor issues along with this PR). Just commit your changes and the PR will get updated by itself.

Please mention if there is any issue relevant to this PR to avoid duplicate works and save time. Thanks for contributing. 🎉