linux-next: build warning after merge of the gpio tree

[Stephen Rothwell]

Hi all,

After merging the gpio tree, today's linux-next build (htmldocs) produced
this warning:

Documentation/admin-guide/gpio/gpio-mockup.rst: WARNING: document isn't 
included in any toctree

Introduced by commit

  2fd1abe99e5f ("Documentation: gpio: add documentation for gpio-mockup")

-- 
Cheers,
Stephen Rothwell

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