Userguide formatting

level 4 headings aren't any good at github...

docs/userguide.md

@@ -78,17 +78,17 @@ Clicking on the ![Web](bnWeb.png) icon opens the homepage of the radio station i
 
 The slider on the side controls the volume.
 
-#### Adding a station using the Shoutcast URL <a name = "manage_add"></a>
+### Adding a station using the Shoutcast URL <a name = "manage_add"></a>
 
 Instead of searching for a station you can also add a station directly with its Shoutcast URL. Just copy the URL to your clipboard, then go to *Station | Paste Shoutcast URL*.
 
 
-#### Checking a station <a name = "manage_check"></a>
+### Checking a station <a name = "manage_check"></a>
 
 ![ProbeStation](screenshots/06_Probing_Station.png)
 
 Choose a station and go to *Station | Check station* to probe it. After a few seconds, the status bar indicates whether the station is broadcasting.
 
-#### Removing a station <a name = "manage_delete"></a>
+### Removing a station <a name = "manage_delete"></a>
 
 To remove a station from your collection, simply select it and go to *Station | Remove station*.