Removed duplicate Note for media preview

[siddhantvirus]

Why:

What's being changed:

This extra line has been removed.
Current version before the PR -> https://docs.github.com/en/free-pro-team@latest/rest/reference/repos#create-a-deployment--parameters

Check off the following:

• 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.

[github-actions]

👋 Hey there spelunker. It looks like you've modified some files that we can't accept as contributions.

• lib/rest/static/decorated/api.github.com.json

You'll need to revert all of these ☝️ files using GitHub Desktop or git checkout origin/main <file name>. Once you get those files reverted, we can continue with the review process.

It looks like you've modified the OpenAPI schema (lib/rest/static/**). While we aren't accepting changes to the schema directly, you can open an issue for any updates to the REST API docs. Head on over to the github/rest-api-description repository to open an issue. ⚡

[janiceilene]

👋 @siddhantvirus Thanks for opening a PR! As the above ☝️ comment explains, this content is autogenerated and can't be changed from this repo. You can open an issue in the github/rest-api-description repository!