This PR was automatically generated by the Update docs from GDevelop commits workflow.

An AI coding agent analysed recent commits in 4ian/GDevelop
and updated the documentation to reflect user-facing changes.

GDevelop commits covered

4db3fd3eb Fix empty number properties of behavior initial value (#8763)
1cb55622b [Auto PR] Update translations (#8755)
387e8c377 Prevent tab closing when renaming Scene, Extensions, External events and External Layouts (#8756)
4d5ea2fb8 Allow to change behavior property values on object instances from the side panel (#8737)
b13ccf3b5 Collapse Physics world properties by default in the scene properties (#8760)
7bb241616 Fix instance creation error message (#8759)
008cf8072 Improve metrics to follow usage trends (creating/editing projects) (#8754)

The AI agent summary is:

I reviewed the commits. The other changes were internal (analytics metrics, tab-rename refactors, instance error messages, bug fixes) or minor UI tweaks (Physics gravity/world-scale marked as advanced, collapsed by default). The one clearly user-facing addition was per-instance behavior property overrides.

Summary: Updated the Scene Editor's Instance Properties panel documentation to note the new Behaviors section, which lets users override a behavior's property values for a specific instance without affecting the object's other instances.

Please review the changes carefully before merging.