[Auto] [Update] Document per-behavior and per-object custom icons in extensions

[github-actions]

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

c364fa899 Fix potential crash in instance properties (#8483)
70f4cf1c1 Fix potential use-after-free in instance properties when deleting scene instances (#8481)
b5ea632ce Upgrade react-dnd to v14 and simplify drag-and-drop setup (#8479)
0f7447feb Bring forward the preview window on the web-app when hot-reloading (#8478)
165648298 Fix some fields of the extension properties (#8480)
cb4263a4b Ensure JSON files end with a new line (#8469)
92e449558 Allow extensions to set different icons for behaviors and objects (#8472)
24ae6c33d Introduce a direct link to open the create dialog (#8460)
2d6ee9164 Fix potential UseAfterFreeError on VariablesContainer.serializeTo
a28869b0b Bump newIDE version
45ac7aaa3 Fix Spine objects not properly loading in the editor anymore (#8476)
a2a8a4c33 Fix a crash when deleting a function folder while one of its function was selected (#8475)

The AI agent summary is:

Summary of changes:

Updated docs/gdevelop5/extensions/share-extension.md to document that individual behaviors and objects within an extension can now have their own custom icons (separate from the extension-level icon). Added a short "Set icons for individual behaviors and objects" paragraph explaining the feature and noting that the extension must have an icon set first.

Please review the changes carefully before merging.

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Project	Deployment	Actions	Updated (UTC)
gdevelop-wiki	Ready	Preview, Comment	Apr 5, 2026 8:23am