Improved
Mobitz II and 2:1 block in the sidebar, with clearer page addresses
Before
Mobitz II and 2:1 block had no sidebar entries of their own, and AV block pages had addresses such as av-block-2-i.
After
Both have their own sidebar entries, and every AV block page has an address you can read, such as second-degree-av-block-mobitz-1.