docs(Layouts): fix LoginLayout

[layershifter]

Fixes #1908.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@ae448ae). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1926   +/-   ##
=========================================
  Coverage          ?   99.77%           
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  Files             ?      148           
  Lines             ?     2637           
  Branches          ?        0           
=========================================
  Hits              ?     2631           
  Misses            ?        6           
  Partials          ?        0

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[levithomason]

Released in semantic-ui-react@0.71.4