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

[Stephen Rothwell]

Hi all,

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

Documentation/block/ublk.rst:353: WARNING: Footnote [#] is not referenced. [ref.footnote]

Introduced by commit

  17970209167d ("ublk: document zero copy feature")

-- 
Cheers,
Stephen Rothwell

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