doc: fix event timer adapter guide

[ upstream commit 4b6fad5cc8a54647a2ea0c0792b25932da9504fc ]

Remove incorrect spec definition from programmers guide, it is
applications responsibility to set ev.event_ptr to a valid value.

Fixes: 30e7fbd ("doc: add event timer adapter guide")

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
Acked-by: Erik Gabriel Carrillo <erik.g.carrillo@intel.com>

doc/guides/prog_guide/event_timer_adapter.rst

@@ -229,9 +229,7 @@ Note that it is necessary to initialize the event timer state to
 RTE_EVENT_TIMER_NOT_ARMED.  Also note that we have saved a pointer to the
 ``conn`` object in the timer's event payload. This will allow us to locate
 the connection object again once we dequeue the timer expiry event from the
-event device later.  As a convenience, the application may specify no value for
-ev.event_ptr, and the adapter will by default set it to point at the event
-timer itself.
+event device later.
 
 Now we can arm the event timer with ``rte_event_timer_arm_burst()``: