`AreaContainmentObject` and `BiomeTag` examples (#2394)
* Add `AreaContainmentObject` tag examples.
Also de-dented code for 'spawnable_blocks' to make it look more uniform :)
* Add `BiomeTag` tag examples.
Mechanism not done as they can't be tested currently.
Fixed up some funky new lines here and there.
* Add better example for `<BiomeTag.downfal_type>`
* Change `<BiomeTag.downfall_type>` one more time.
Returns specific data, and so it should probably be shown in the example.
* Update a few examples to have more clear comments.
* Clean up and `BiomeTag` mech examples.
(
commit: 475612b)
