docs(ime): correct the Electron.Input marker note on the detector input type

Electron.Input does carry isComposing; only the numeric keyCode is absent.

Co-authored-by: Orca <help@stably.ai>

src/shared/modifier-double-tap-detector.ts

@@ -27,7 +27,8 @@ export type ModifierKeyEventLike = {
   alt?: boolean
   meta?: boolean
   isAutoRepeat?: boolean
-  // Optional so non-DOM callers (Electron before-input-event) keep their current behavior.
+  // Optional because `Electron.Input` has no numeric keyCode; it does carry isComposing, so the
+  // before-input-event callers pass that one.
   isComposing?: boolean
   keyCode?: number
 }