fix(Icon): add 'file text outline' type

[paulkoegel-wessels]

Icon "file text outline" exists in the code but not in the SemanticICONS type.

This PR adds the missing string literal to the SemanticICONS type as well as SUI.js.

Left (highlighted):
<Icon name="file text outline" />

Right:
<Icon name="file text" />

[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.

[layershifter]

Please add it into SUI.js, too.

[codecov-io]

Codecov Report

Merging #2993 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2993   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files         163      163           
  Lines        2743     2743           
=======================================
  Hits         2742     2742           
  Misses          1        1

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[welcome]

Congrats on merging your first pull request! 🎉🎉🎉

[levithomason]

Released in [email protected].