docs(Form): fix group variations typo

[elliottcarlson]

The message info references widths='even' which is an invalid widths type - the correct value should be equals.

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• Run yarn lint locally to catch formatting errors. This will fix some errors automatically, commit and push any changes.
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[codecov-io]

Codecov Report

Merging #2823 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2823   +/-   ##
=======================================
  Coverage   99.74%   99.74%           
=======================================
  Files         160      160           
  Lines        2773     2773           
=======================================
  Hits         2766     2766           
  Misses          7        7

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[levithomason]

Thank you! Fixed typo equals => equal, good to merge once tests pass.

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Congrats on merging your first pull request! 🎉🎉🎉

[levithomason]

Released in semantic-ui-react@0.80.1.