docs(Search): fix wrong description for input shorthand

[ablakey]

Diff is self explanatory. The documentation for the Search.input proptype is not accurate.

[welcome]

💖 Thanks for opening this pull request! 💖

Here is a list of things that will help get it across the finish line:

• Run yarn lint locally to catch formatting errors. This will fix some errors automatically, commit and push any changes.
• Run yarn test locally to catch errors. This ensures all components still behave as they should.
• Run yarn start to run the doc site locally and try a few pages, ensuring everything is in good working order.
• Include tests when adding/changing behavior.

We get a lot of pull requests on this repo, so please be patient and we will get back to you as soon as we can.

[codecov-io]

Codecov Report

Merging #3727 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3727      +/-   ##
==========================================
- Coverage   99.83%   99.83%   -0.01%     
==========================================
  Files         175      175              
  Lines        3122     3120       -2     
==========================================
- Hits         3117     3115       -2     
  Misses          5        5

Impacted Files	Coverage Δ
src/modules/Search/Search.js	99.54% <ø> (ø)	⬆️
src/modules/Checkbox/Checkbox.js	100% <0%> (ø)	⬆️
src/modules/Transition/Transition.js	100% <0%> (ø)	⬆️
src/views/Feed/FeedContent.js	100% <0%> (ø)	⬆️
src/modules/Dropdown/Dropdown.js	100% <0%> (ø)	⬆️

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[welcome]

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