rollback: move examples and --force note in help into verbose section

Plain 'hg help rollback' now looks like this:

  $ hg help rollback
  hg rollback

  roll back the last transaction (dangerous)

      This command should be used with care. There is only one level of
      rollback, and there is no way to undo a rollback. It will also restore
      the dirstate at the time of the last transaction, losing any dirstate
      changes since that time. This command does not alter the working
      directory.

      Transactions are used to encapsulate the effects of all commands that
      create new changesets or propagate existing changesets into a repository.

      This command is not intended for use on public repositories. Once changes
      are visible for pull by other users, rolling a transaction back locally
      is ineffective (someone else may already have pulled the changes).
      Furthermore, a race is possible with readers of the repository; for
      example an in-progress pull from the repository may fail if a rollback is
      performed.

      Returns 0 on success, 1 if no rollback data is available.

  options:

   -n --dry-run do not perform actions, just print output
   -f --force   ignore safety measures
      --mq      operate on patch repository

  use "hg -v help rollback" to show more info

mercurial/commands.py

@@ -4898,6 +4898,8 b' def rollback(ui, repo, **opts):'
     that create new changesets or propagate existing changesets into a
     repository.
 
+    .. container:: verbose
+
     For example, the following commands are transactional, and their
     effects can be rolled back: