H2: Update a title

exercises/h2.md

@@ -154,7 +154,7 @@ The following journalctl snapshot tells that there is an issue with the bluetoot
 
 Bluetooth error messages: lines 7-19. Line 8 is not an error message.
 
-#### journalctl analysis - regression test approach
+**Analysis - regression test approach:**
 
 The problem seem to be widely known among Ubuntu & Arch Linux users, according to a short search in the internet. There is a [launchpad report](https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1490349) but not a simple answer is given there. There is a suggestion to downgrade bluez package on [Arch Linux forum](https://bbs.archlinux.org/viewtopic.php?id=195886). [AskUbuntu](https://askubuntu.com/) website has many threads for this issue.