Improve precision of documentation of ... for xpose_data

[billdenney]

Fixes #97

[codecov]

Codecov Report

Merging #98 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #98   +/-   ##
=======================================
  Coverage   95.91%   95.91%           
=======================================
  Files          40       40           
  Lines        3327     3327           
=======================================
  Hits         3191     3191           
  Misses        136      136

Impacted Files	Coverage Δ
R/xpose_data.R	100% <ø> (ø)	⬆️

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[billdenney]

As I've tried to work with this patch, there are a lot of places within xpose that expect the ID column to be named "ID". This patch breaks too many other things to be useful right now. I'm going to propose another patch that works the opposite direction (assigning the mapped name to the expected name).