[PATCH] doc: announce changes to event vector structure

[<pbhagavatula@marvell.com>]

From: Pavan Nikhilesh <pbhagavatula@marvell.com>

The structure ``rte_event_vector`` will be modified to include
``elem_offset:12`` bits taken from ``rsvd:15``.
The ``elem_offset`` defines the offset into the vector array from
which valid elements are present.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
---
 doc/guides/rel_notes/deprecation.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
index 4e5b23c53d..d7933629f2 100644
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -125,3 +125,10 @@ Deprecation Notices
   applications should be updated to use the ``dmadev`` library instead,
   with the underlying HW-functionality being provided by the ``ioat`` or
   ``idxd`` dma drivers
+
+* eventdev: The structure ``rte_event_vector`` will be modified to include
+  ``elem_offset:12`` bits taken from ``rsvd:15``. The ``elem_offset`` defines
+  the offset into the vector array from which valid elements are present.
+  The difference between ``rte_event_vector::nb_elem`` and
+  ``rte_event_vector::elem_offset`` gives the number of valid elements left to
+  process from the ``rte_event_vector::elem_offset``.
-- 
2.25.1