doc: fix double words

Fix double words "the the" in various files
within Documentations.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/futex-requeue-pi.txt b/Documentation/futex-requeue-pi.txt
index 9dc1ff4..31b1661 100644
--- a/Documentation/futex-requeue-pi.txt
+++ b/Documentation/futex-requeue-pi.txt
@@ -67,7 +67,7 @@
 	   lock(cond->__data.__lock);
 	} while(...)
 	unlock(cond->__data.__lock);
-        /* the kernel acquired the the mutex for us */
+        /* the kernel acquired the mutex for us */
 }
 
 pthread_cond_broadcast_pi(cond)