Update finding-discussions-across-multiple-repositories.md

[zaralogue]

changed instruction text to direct user to click on "Your discussions" instead of "Your enterprises"

Why:

What's being changed:

Check off the following:

• All of the tests are passing.
• I have reviewed my changes in staging. (look for the deploy-to-heroku link in your pull request, then click View deployment)
• For content changes, I have reviewed the localization checklist
• For content changes, I have reviewed the Content style guide for GitHub Docs.

[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.

[megbird]

Perfect timing catching this ⚡ Once the tests pass we'll merge it in ❤️

[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.

[anhy999]

#1978