Documentation: locking: ww-mutex-design: drop duplicated word

Drop the doubled word "up".
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20200703213649.30948-3-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/locking/ww-mutex-design.rst

@@ -49,7 +49,7 @@ However, the Wound-Wait algorithm is typically stated to generate fewer backoffs
 compared to Wait-Die, but is, on the other hand, associated with more work than
 Wait-Die when recovering from a backoff. Wound-Wait is also a preemptive
 algorithm in that transactions are wounded by other transactions, and that
-requires a reliable way to pick up up the wounded condition and preempt the
+requires a reliable way to pick up the wounded condition and preempt the
 running transaction. Note that this is not the same as process preemption. A
 Wound-Wait transaction is considered preempted when it dies (returning
 -EDEADLK) following a wound.