Add info about event types into instructions

Author: screfy

public/index.html

@@ -149,7 +149,8 @@ <h2>Instructions</h2>
 						target="_blank"
 						>Linear Webhook</a
 					>
-					and paste there your copied webhook URL.
+					(with <strong>Issue</strong> and <strong>Issue comments</strong> event
+					types) and paste there your copied webhook URL.
 				</li>
 			</ol>
 		</div>