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

[Stephen Rothwell]

Hi all,

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

Documentation/nios2/index.rst:7: WARNING: toctree contains reference to 
nonexisting document 'nios2/features'

Introduced by commit

  ed13a92d0fde ("docs: archis: add a per-architecture features list")

-- 
Cheers,
Stephen Rothwell

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