docs: update to next version [BUMP BETA] (#4493)

platform/docs/versioned_docs/version-3.9/user-guide/viewer/hotkeys.md

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+---
+sidebar_position: 7
+---
+
+# Hotkeys
+
+To open the hotkey assignment panel, you can click on the Preferences gear on the
+top right side of the viewer.
+
+
+Below, you can see the default hotkeys key bindings:
+
+![user-hotkeys-default](../../assets/img/user-hotkeys-default.png)
+
+Hotkeys can be assigned to custom bindings that persist for the duration of the browser session.