Documentation/admin-guide: sysctl/kernel: drop doubled word

Drop the doubled word "set".
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Link: https://lore.kernel.org/r/20200704032020.21923-12-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/admin-guide/sysctl/kernel.rst

@@ -235,7 +235,7 @@ This toggle indicates whether unprivileged users are prevented
 from using ``dmesg(8)`` to view messages from the kernel's log
 buffer.
 When ``dmesg_restrict`` is set to 0 there are no restrictions.
-When ``dmesg_restrict`` is set set to 1, users must have
+When ``dmesg_restrict`` is set to 1, users must have
 ``CAP_SYSLOG`` to use ``dmesg(8)``.
 
 The kernel config option ``CONFIG_SECURITY_DMESG_RESTRICT`` sets the