https://doc.qt.io/qtdesignstudio/qtquick-curve-editor.html
Found issues:

1.  ** Picture of the Curves view is old, showing the view name as "CurveEditor" and old toolbar
2. "To lock an animation curve, hover the mouse over the keyframe in the list.." -> instead of "keyframe", should it be "property"? Same in "To pin an animation curve...".
3. Icon for Spline button is incorrect, should be
4. Set Default is not found in toolbar anymore, could be removed.
5. Unify is missing button icon, should be
6. Zoom in/out buttons missing from Curves Toolbar description
7. "Select keyframes to display the easing curves attached to them." -> not sure what this means? I don't see anything extra by selecting a keyframe.
8. "To delete the selected keyframe, select Delete All Keyframes in the context menu." -> no such option, should be "Delete Selected Keyframes"
9. Documentation is missing a description how to apply linear/step/spline interpolation between keyframes (select keyframe(s) -> set the one you want by clicking the toolbar button)