updated adjustment to Rd warnings

[bdsimpson]

Updated to use
@param x a tbl; see \link[dplyr:join]{inner_join}
and
@param .data a tbl; see \link[dplyr:mutate]{transmute}

To avoid install warning

Yes, this is probably something that should be handled by roxygen, but it's been an issue for over a year, so I'm not sure it's high on their list

[elbersb]

great!