Add N&N for find/replace enhancement: key bindings, content assist

[HeikoKlare]

See:

• Find/Replace Overlay: Allow rebinding shortcuts eclipse.platform.ui#2015
• Find/Replace Overlay: "Content Assist Available" ctrl+space does not work in .java files eclipse.platform.ui#2651

[Copilot]

Pull request overview

Adds New & Noteworthy documentation to the Eclipse 4.41 Platform notes, describing recent usability enhancements to the editor’s Find/Replace overlay (key binding customization and regex content assist), aligned with the linked eclipse.platform.ui issues.

Changes:

• Document that Find/Replace overlay actions are now exposed as standard Eclipse commands and can be rebound in Preferences > General > Keys.
• Document that regex content assist in the Find/Replace overlay is now available across all editors supporting the overlay.
• Add screenshots illustrating both enhancements.

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