Update hello-world.md

[zemmelmootez]

the link is updated

Elements Default PR Template

In general, make sure you have: (check the boxes to acknowledge you've followed this template)

• Read CONTRIBUTING.md

Other Available PR Templates:

• Release: https://github.com/stoplightio/elements/compare?template=release.md
  • Read the release section of CONTRIBUTING.md

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