apply #390: improve formatting of parameter list in RTD

[prjemian]

Following #390, where formatting of the parameter list in utils.quantify_md_key_use() was changed, apply this to the other parameter lists. Example:

    PARAMETERS

    key
        *str* :
        one of the metadata keys in a run's start document
        (default: ``plan_name``)
    db
        *object* :
        Instance of databroker v1 ``Broker`` or v2 ``catalog``
        (default: see ``catalog_name`` keyword argument)

[prjemian]

Compare the formatting from previous type:

with the improvement from #390: