def returner_doc(*args):
    '''
    Return the docstrings for all returners. Optionally, specify a returner or a
    function to narrow the selection.

    The strings are aggregated into a single document on the master for easy
    reading.

    Multiple returners/functions can be specified.

    .. versionadded:: 2014.7.0

    CLI Example:

    .. code-block:: bash

        salt '*' sys.returner_doc
        salt '*' sys.returner_doc sqlite3
        salt '*' sys.returner_doc sqlite3.get_fun
        salt '*' sys.returner_doc sqlite3.get_fun etcd.get_fun

    Returner names can be specified as globs.

    .. versionadded:: 2015.5.0

    .. code-block:: bash

        salt '*' sys.returner_doc 'sqlite3.get_*'

    '''

    returners_ = salt.loader.returners(__opts__, [])
    docs = {}
    if not args:
        for fun in returners_:
            docs[fun] = returners_[fun].__doc__
        return _strip_rst(docs)

    for module in args:
        _use_fnmatch = False
        if '*' in module:
            target_mod = module
            _use_fnmatch = True
        elif module:
            # allow both "sys" and "sys." to match sys, without also matching
            # sysctl
            target_mod = module + '.' if not module.endswith('.') else module
        else:
            target_mod = ''
        if _use_fnmatch:
            for fun in returners_:
                if fun == module or fun.startswith(target_mod):
                    docs[fun] = returners_[fun].__doc__
        else:
            for fun in six.iterkeys(returners_):
                if fun == module or fun.startswith(target_mod):
                    docs[fun] = returners_[fun].__doc__
    return _strip_rst(docs)
Return the docstrings for all returners. Optionally, specify a returner or a
    function to narrow the selection.

    The strings are aggregated into a single document on the master for easy
    reading.

    Multiple returners/functions can be specified.

    .. versionadded:: 2014.7.0

    CLI Example:

    .. code-block:: bash

        salt '*' sys.returner_doc
        salt '*' sys.returner_doc sqlite3
        salt '*' sys.returner_doc sqlite3.get_fun
        salt '*' sys.returner_doc sqlite3.get_fun etcd.get_fun

    Returner names can be specified as globs.

    .. versionadded:: 2015.5.0

    .. code-block:: bash

        salt '*' sys.returner_doc 'sqlite3.get_*'