docs(docs): 📝 add missing command docs

docs/api/commands/keyboard-shortcut.md

@@ -1,5 +1,12 @@
 # keyboardShortcut
+The `keyboardShortcut` command will try to trigger a ShortcutEvent with a given name.
 
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+## Parameters
+`name: String`
+
+The name of the shortcut to trigger.
+
+## Usage
+```js
+editor.commands.keyboardShortcut('undo')
+```