Check for newline instead of an arbitrary length for showing hover hint (#204873)

This should show the hint less in scenarios where we don't need it.

src/vs/platform/quickinput/browser/quickInput.ts

@@ -1283,7 +1283,7 @@ export class QuickInputHoverDelegate implements IHoverDelegate {
 				: typeof options.content === 'string'
 					? options.content
 					: options.content.value
-		).length > 20;
+		).includes('\n');
 		return this.hoverService.showHover({
 			...options,
 			persistence: {