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

[Stephen Rothwell]

Hi all,

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

Documentation/trace/debugging.rst: WARNING: document isn't included in any toctree

Introduced by commit

  2fcd5aff92aa ("tracing/Documentation: Start a document on how to debug with tracing")

-- 
Cheers,
Stephen Rothwell

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