Add info about DRAGONX checkpoints to release process

doc/release-process.md

@@ -76,6 +76,7 @@ Install deps on Linux:
      - Comment out the HUSHVER line and uncomment the line above it with a hardcoded version number
    - PROTIP: Man page creation must be done after updating the version number and recompiling and before Debian package creation
  - Update checkpoints in src/chainparams.cpp via util/checkpoints.pl
+   - Run "./util/checkpoints.pl help" to get example usage
    - hushd must be running to run this script, since it uses hush-cli to get the data
    - Look for line which says "END HUSH mainnet checkpoint data" near line 560 in chainparams.cpp , that is where checkpoint data ends
    - Find the highest block height of checkpoint data, let's call it HEIGHT
@@ -95,6 +96,7 @@ Install deps on Linux:
      - They only provide limited security, because they talk about the past, not future block heights.
    - Try to generate checkpoints as close to the release as possible, so you can have a recent block height be protected.
      - For instance, don't update checkpoints and then do a release a month later. You can always update checkpoint data again or multiple times
+   - DRAGONX now has checkpoints, you can generate them with: `./util/checkpoints.pl 1000 1 DRAGONX`
  - Update copyright years if applicable. Example: `./util/update-copyrights.h 2022 2023`
  - Update doc/relnotes/README.md
    - To get the stats of file changes: `git diff --stat master...dev`