Some plugin command option help strings were using invalid syntax to
refer to another option. This looked odd in CLI output
--marker <ID> Begin displaying the results for IDs greater than
thespecified marker. When used with :option:`--limit,`
setthis to the last ID displayed in the previous run.
and also caused building autoprogram-cliff from python-openstackclient
to break with errors like:
<ListDatabaseInstances>:1:unknown option: --limit,
This commit reformats the help strings to use double backticks, which
render sanely in the CLI help and also build properly from
python-openstackclient.
Change-Id: Ia3fd6d5ec76e0e6d6aee87d8a8790a1ed2d38a26