docs: Fix missing word in spectre.rst
Corrects a missing word in the hardware vulnerability docs.
Signed-off-by: Will Pierce <pierwill@protonmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <Ru-d3ltJIyY4Oc6tzHwpSiDeFwSLHEzd7Utcr6iobgIy1B8wLRI4f6JiCb0a9n-0-r19d0dyLL3yS8KWVcyHfpkyDErWXYTkI3AJfUPTNCc=@protonmail.com>
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