Add links to website FAQ for library update and download warning notifications

(cherry picked from commit 70698e6494)

app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateNotifier.kt

@@ -96,6 +96,7 @@ class LibraryUpdateNotifier(private val context: Context) {
             setStyle(NotificationCompat.BigTextStyle().bigText(context.getString(R.string.notification_size_warning)))
             setSmallIcon(R.drawable.ic_warning_white_24dp)
             setTimeoutAfter(Downloader.WARNING_NOTIF_TIMEOUT_MS)
+            setContentIntent(NotificationHandler.openUrl(context, HELP_WARNING_URL))
         }
 
         context.notificationManager.notify(
@@ -340,6 +341,10 @@ class LibraryUpdateNotifier(private val context: Context) {
         }
         return PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)
     }
+
+    companion object {
+        const val HELP_WARNING_URL = "https://tachiyomi.org/help/faq/#why-does-the-app-warn-about-large-bulk-updates-and-downloads"
+    }
 }
 
 private const val NOTIF_MAX_CHAPTERS = 5