Documentation/atomic_t: Emphasize that failed atomic operations give no ordering

The ORDERING section of Documentation/atomic_t.txt can easily be read as
saying that conditional atomic RMW operations that fail are ordered when
those operations have the _acquire() or _release() suffixes.  This is
not the case, therefore update this section to make it clear that failed
conditional atomic RMW operations provide no ordering.

Reported-by: Anna-Maria Behnsen <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Cc: Alan Stern <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: David Howells <[email protected]>
Cc: Jade Alglave <[email protected]>
Cc: Luc Maranget <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Akira Yokosawa <[email protected]>
Cc: Daniel Lustig <[email protected]>
Cc: Joel Fernandes <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Acked-by: Andrea Parri <[email protected]>
Acked-by: Mark Rutland <[email protected]>

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