Elaborate on steps performed in bootstrap repo host.

doc/deploying_ros_bootstrap_repo_imports.md

@@ -21,7 +21,7 @@ The `refactor` branch contains the reprepro-updater library sources used by the
 1. Open a pull request on [ros-infrastructure/reprepro-updater](https://github.com/ros-infrastructure/reprepro-updater).
 1. Verify that the source package checks pass on the pull request and review the changes.
 1. Once approved and ready for import, merge the pull request.
-1. Access repos.ros.org via ssh, the following console commands will be run on the repos host.
+1. Access `apt@repos.ros.org` via ssh, the following console commands will be run on the repos host.
 1. Navigate to the `~/reprepro-updater` repository checkout.
 ```
 cd ~/reprepro-updater
@@ -38,6 +38,8 @@ python3 scripts/aptly/aptly_importer.py config/PATH_TO_CHANGED_CONFIG
 ```
 ~/bin/snapshot-and-publish-all ros_bootstrap
 ```
-1. Once this process has completed, trigger `import_upstream` jobs on **both** (no matter if the PR is targeted to just one)  [build.ros.org](https://build.ros.org/job/import_upstream) and [build.ros2.org](https://build.ros2.org/job/import_upstream)
+The script will create new aptly snapshot of ALL the repositories controlled by aptly and switch the public package repositories to these new set of snapshots.
+At this point, if no error appeared, the public repositories at <http://repos.ros.org/repos/ros_bootstrap> should contain the new packages.
+1. Once this process has completed, trigger `import_upstream` jobs on **both** (no matter if the PR is targeted to just one)  [build.ros.org](https://build.ros.org/job/import_upstream) and [build.ros2.org](https://build.ros2.org/job/import_upstream).
 Update the build description with a message about the updated packages and a link to the reprepro-updater PR.
 1. Update the reprepro-updater PR with a comment containing links to the import_upstream jobs.