memory-barriers: Fix description of data dependency barriers

In the description of data dependency barriers the words 'before' is
used erroneously. Since such barrier order dependent loads one after
the other. So substitute 'before' with 'after'.

Signed-off-by: Nikolay Borisov <[e-mail]>
Signed-off-by: Paul E. McKenney <[e-mail]>
Acked-by: Peter Zijlstra <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: [e-mail]
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Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
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Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Ingo Molnar <[e-mail]>

Documentation/memory-barriers.txt

···
      where two loads are performed such that the second depends on the result
      of the first (eg: the first load retrieves the address to which the second
      load will be directed), a data dependency barrier would be required to
-     make sure that the target of the second load is updated before the address
+     make sure that the target of the second load is updated after the address
      obtained by the first load is accessed.
 
      A data dependency barrier is a partial ordering on interdependent loads