Update README.adoc

Co-authored-by: Jamie Gillenwater <[email protected]>

Author: polandll

README.adoc

@@ -176,6 +176,8 @@ The following steps must be completed in each doc repository:
 . Update all affected playbooks with an appropriate UI bundle url.
 . Test if the UI is building correctly with a local build.
 . Get PR approval and merge the PR to the appropriate branch (`main` for most repositories).
+. Rebuild one updated playbook.
+. Deploy to coppi to review the build to ensure the latest UI changes are working.
 . Rebuild the documentation for all affected playbooks using the scripsi `bsys` command.
 . Deploy to docs-preview and sync all docsets.