Fix REST API schema output

[roborourke]

Schema properties should have been callbacks.

[roborourke]

That's alright, it's on me to check and these were the only ones I found.

[hm-backport[bot]]

The backport to v4-1-branch failed:

Commits ["85a8b1a85678145ff0f06fa5941d94d266bcdc60","9d805ad9b800b93deae0762957810d262c5ff553"] could not be cherry-picked on top of v4-1-branch

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub.
git fetch
# Create new working tree.
git worktree add .worktrees/backport v4-1-branch
# Navigate to the new directory.
cd .worktrees/backport
# Cherry-pick all the commits of this pull request and resolve the likely conflicts.
git cherry-pick 85a8b1a85678145ff0f06fa5941d94d266bcdc60 9d805ad9b800b93deae0762957810d262c5ff553
# Create a new branch with these backported commits.
git checkout -b backport-546-to-v4-1-branch
# Push it to GitHub.
git push --set-upstream origin backport-546-to-v4-1-branch
# Go back to the original working tree.
cd ../..
# Delete the working tree.
git worktree remove .worktrees/backport

Then, create a pull request where the base branch is v4-1-branch and the compare/head branch is backport-546-to-v4-1-branch.

[hm-backport[bot]]

The backport to v4-3-branch failed:

Commits ["85a8b1a85678145ff0f06fa5941d94d266bcdc60","9d805ad9b800b93deae0762957810d262c5ff553"] could not be cherry-picked on top of v4-3-branch

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub.
git fetch
# Create new working tree.
git worktree add .worktrees/backport v4-3-branch
# Navigate to the new directory.
cd .worktrees/backport
# Cherry-pick all the commits of this pull request and resolve the likely conflicts.
git cherry-pick 85a8b1a85678145ff0f06fa5941d94d266bcdc60 9d805ad9b800b93deae0762957810d262c5ff553
# Create a new branch with these backported commits.
git checkout -b backport-546-to-v4-3-branch
# Push it to GitHub.
git push --set-upstream origin backport-546-to-v4-3-branch
# Go back to the original working tree.
cd ../..
# Delete the working tree.
git worktree remove .worktrees/backport

Then, create a pull request where the base branch is v4-3-branch and the compare/head branch is backport-546-to-v4-3-branch.