spell checking: Add suggested corrections at the top of the context menu

[Tamaranch]

Is your feature request related to a problem?

Suggested corrections are not easily accessible, especially from the keyboard: you have to go to the spellcheck submenu, at the very bottom of the context menu, then to the bottom of this submenu, where you're cluttered with other rarely useful options (add to dictionary, etc.).

Describe the solution you'd like

Instead, suggested corrections should appear immediately, in bold, at the very top of the context menu, as Firefox does. This doesn't mean you can't keep the spellcheck submenu for rarely-used options, of course.

Describe alternatives you've considered

None.

Additional context

No response