docs(IconSearch): fix copy to clipboard

[levithomason]

Fixes #1314

This PR:

• fixes copy to clipboard for the Icon search
• fixes the prop table's display of default and required props for all components

[codecov-io]

Codecov Report

Merging #1317 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1317   +/-   ##
=======================================
  Coverage   99.75%   99.75%           
=======================================
  Files         140      140           
  Lines        2402     2402           
=======================================
  Hits         2396     2396           
  Misses          6        6

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