Support explicit example cross-link #3
Description
On https://www.onegraph.com/schema/example/GitHubGetPullRequest the link for Add a comment to a Pull Request as a related example erroneously pointed to GitHubAddPullRequestCommentMutation instead of GitHubAddPullRequestComment.
It would be nice to be able to have a uri structure that explicitly linked to other examples in the markdown transform, e.g. examples://GitHubAddPullRequestComment. Then they could be extracted and transformed into the right links, and possibly even fail the build if they link to a missing example (that's not a great user experience).