docs/data/reusables/rest-reference/pulls/comments.md

Review comments

Pull request review comments are comments on a portion of the unified diff made during a pull request review. Commit comments and issue comments are different from pull request review comments. You apply commit comments directly to a commit and you apply issue comments without referencing a portion of the unified diff. For more information, see "Create a commit comment" and "Create an issue comment."

Custom media types for pull request review comments

These are the supported media types for pull request review comments.

application/vnd.github.VERSION.raw+json
application/vnd.github.VERSION.text+json
application/vnd.github.VERSION.html+json
application/vnd.github.VERSION.full+json

For more information, see "Custom media types."