Mention checkpoints in our release doc

doc/release-process.md

@@ -28,6 +28,11 @@ git commit -am "update translations"
 git push
 ```
 
+## Adding Checkpoints
+
+Adding checkpoints make SDL sync much faster, especially for brand new wallets. If there are no recent checkpoints,
+when a user makes a new wallet, it will sync from a block far in the past, which wastes time, bandwidth and CPU resources. To add a checkpoint ...
+
 ## Release process
 
 ...