Documentation: circular-buffers: use READ_ONCE()

While the {READ,WRITE}_ONCE() macros should be used in preference to
ACCESS_ONCE(), the circular buffer documentation uses the latter
exclusively.

To point people in the right direction, and as a step towards the
eventual removal of ACCESS_ONCE(), update the documentation to use
READ_ONCE(), as ACCESS_ONCE() is only used in a reader context in the
circular buffer documentation.

Signed-off-by: Mark Rutland <[email protected]>
Acked-by: David Howells <[email protected]>
Acked-by: Paul E. McKenney <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>

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