Fix UG URL

Author: zzkzzzz

src/main/java/seedu/address/ui/HelpWindow.java

@@ -16,7 +16,7 @@
 public class HelpWindow extends UiPart<Stage> {
 
     public static final String USERGUIDE_URL =
-            "https://ay2122s2-cs2103-f09-3.github.io/tp/UserGuide.html#delete-insurance";
+            "https://ay2122s2-cs2103-f09-3.github.io/tp/UserGuide.html";
     public static final String HELP_MESSAGE = "Refer to the user guide: " + USERGUIDE_URL;
 
     private static final Logger logger = LogsCenter.getLogger(HelpWindow.class);