Documentation: filesystems: fsverity: drop doubled word

Drop the doubled word "the".

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Eric Biggers <ebiggers@kernel.org>
Cc: Theodore Y. Ts'o <tytso@mit.edu>
Cc: linux-fscrypt@vger.kernel.org
Link: https://lore.kernel.org/r/20200703214325.31036-6-rdunlap@infradead.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/filesystems/fsverity.rst

@@ -659,7 +659,7 @@ weren't already directly answered in other parts of this document.
       retrofit existing filesystems with new consistency mechanisms.
       Data journalling is available on ext4, but is very slow.
 
-    - Rebuilding the the Merkle tree after every write, which would be
+    - Rebuilding the Merkle tree after every write, which would be
       extremely inefficient.  Alternatively, a different authenticated
       dictionary structure such as an "authenticated skiplist" could
       be used.  However, this would be far more complex.