seqlock: Better document raw_write_seqcount_latch()

Improve the documentation of the latch technique as used in the
current timekeeping code, such that it can be readily employed
elsewhere.

Borrow from the comments in timekeeping and replace those with a
reference to this more generic comment.

Cc: Andrea Arcangeli <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Reviewed-by: Mathieu Desnoyers <[email protected]>
Acked-by: Michel Lespinasse <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>

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