message: Improve scripted-diff developer docs
  Instead of verifying all scripted-diffs, provide an example that only verifies all scripted-diffs in commits since `origin/master.
diff: @@ -827,7 +827,16 @@ To create a scripted-diff:
  - `-BEGIN VERIFY SCRIPT-`
  - `-END VERIFY SCRIPT-`
  -The scripted-diff is verified by the tool `test/lint/commit-script-check.sh`
  +The scripted-diff is verified by the tool `test/lint/commit-script-check.sh`. The tool's default behavior when supplied
  +with a commit is to verify all scripted-diffs from the beginning of time up to said commit. Internally, the tool passes
  +the first supplied argument to `git rev-list --reverse` to determine which commits to verify script-diffs for, ignoring
  +commits that don't conform to the commit message format described above.
  +
  +For development, it might be more convenient to verify all scripted-diffs in a range `A..B`, for example:
  +
  +```bash
  +test/lint/commit-script-check.sh origin/master..HEAD
  +```
  Commit [`bb81e173`](https://github.com/bitcoin/bitcoin/commit/bb81e173) is an example of a scripted-diff.
  