Fix typos for Digital Millennium Copyright Act

[tnir]

Why:

The less typos, the easier read.

What's being changed:

Fixes typos for Digital Millennium Copyright Act.

URLs on review apps on heroku

• https://docs-688--dmca-typos-in-site-p.herokuapp.com/en/free-pro-team@latest/github/site-policy/github-enterprise-subscription-agreement#352-copyright-infringement-and-dmca-policy
• https://docs-688--dmca-typos-in-site-p.herokuapp.com/en/free-pro-team@latest/github/site-policy/github-supplemental-terms-for-microsoft-volume-licensing#252-copyright-infringement-and-dmca-policy

cf. https://github.com/contact/dmca

Check off the following:

• All of the tests are passing.
• I have reviewed my changes in staging.
• For content changes, I have reviewed the localization checklist
• For content changes, I have reviewed the Content style guide for GitHub Docs.

[janiceilene]

Thanks @tnir 🌟 I'll get this updated and 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.