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This fixes a minor typo.

Fixes: 34433332

 ("docs: ABI: testing: make the files compatible with ReST output")
Signed-off-by: Michael Weiß <michael.weiss@aisec.fraunhofer.de>
Link: https://lore.kernel.org/r/20210215102031.10622-1-michael.weiss@aisec.fraunhofer.de

Signed-off-by: Jonathan Corbet <corbet@lwn.net>