* Enable `checkpoint_sync` by default
Provide fast synchronization by default.
* Add newline to separate fields
Make it slighly easier to read.
* Update `checkpoint_sync` documentation
Change the documentation to match the new default value, and explain
that changing the value can be used for debugging.
* Improve documentation
Remove `post-Canopy`, because Zebra will likely change checkpoint
heights in the future. Also explain better what the checkpoints are and
why it helps with debugging.
Co-authored-by: teor <teor@riseup.net>
Co-authored-by: teor <teor@riseup.net>