Add Istanbul release in overview section

Issue-ID: DOC-771
Signed-off-by: Eric Debeau <eric.debeau@orange.com>
Change-Id: I050f03cded43301fd56fcf8998238bdc0ef4fa94
diff --git a/docs/guides/overview/overview.rst b/docs/guides/overview/overview.rst
index d54a1a8..2978a78 100644
--- a/docs/guides/overview/overview.rst
+++ b/docs/guides/overview/overview.rst
@@ -163,6 +163,8 @@
 +-----------------+----------------+------------------------+
 |Release Name     |Release Version |Release Date            |
 +=================+================+========================+
+|Istanbul         |9.0.0           | November 4th, 2021     |
++-----------------+----------------+------------------------+
 |Honolulu         |8.0.0           | May 11th, 2021         |
 +-----------------+----------------+------------------------+
 |Guilin           |7.0.0           | December 3rd, 2020     |