Documentation: Remove bogus claim about del_timer_sync()

del_timer_sync() does not return the number of times it tried to delete the
timer which rearms itself. It's clearly documented:

 The function returns whether it has deactivated a pending timer or not.

This part of the documentation is from 2003 where del_timer_sync() really
returned the number of deletion attempts for unknown reasons. The code
was rewritten in 2005, but the documentation was not updated.

Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Jacob Keller <[email protected]>
Reviewed-by: Anna-Maria Behnsen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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