Update documentation of "type" prop

[jamesplease]

• References the Body mixin docs, which is where the methods come from
• Includes additional prop types from #14

This is a follow up from #14

[codecov-io]

Codecov Report

Merging #21 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #21   +/-   ##
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  Coverage   81.81%   81.81%           
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  Files           1        1           
  Lines          33       33           
  Branches        7        7           
=======================================
  Hits           27       27           
  Misses          5        5           
  Partials        1        1

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