src/vs/editor/contrib/comment/comment.ts/BlockCommentAction/constructor
class BlockCommentAction:	constructor() {
		super({
			id: 'editor.action.blockComment',
			label: nls.localize('comment.block', "Toggle Block Comment"),
			alias: 'Toggle Block Comment',
			precondition: EditorContextKeys.writable,
			kbOpts: {
				kbExpr: EditorContextKeys.editorTextFocus,
				primary: KeyMod.Shift | KeyMod.Alt | KeyCode.KEY_A,
				linux: { primary: KeyMod.CtrlCmd | KeyMod.Shift | KeyCode.KEY_A },
				weight: KeybindingWeight.EditorContrib
			},
			menuOpts: {
				menuId: MenuId.MenubarEditMenu,
				group: '5_insert',
				title: nls.localize({ key: 'miToggleBlockComment', comment: ['&& denotes a mnemonic'] }, "Toggle &&Block Comment"),
				order: 2
			}
		});
	}