update composite release notes: fix version number

Issue-ID: DOC-784

Signed-off-by: thmsdt <thomas.kulik@telekom.de>
Change-Id: I12a6bbf662323759e8e49aa98de02596174bd38f
diff --git a/docs/release/index.rst b/docs/release/index.rst
index 0bd6346..587a1f2 100644
--- a/docs/release/index.rst
+++ b/docs/release/index.rst
@@ -19,7 +19,7 @@
 Details on the specific items delivered in each release by each component is
 maintained in the component specific release notes.
 
-Istanbul Maintenance Release 9.1.0
+Istanbul Maintenance Release 9.0.1
 ==================================
 
 +--------------------------------------+--------------------------------------+
@@ -29,7 +29,7 @@
 | **Release name**                     | Istanbul                             |
 |                                      |                                      |
 +--------------------------------------+--------------------------------------+
-| **Release version**                  | 9.1.0                                |
+| **Release version**                  | 9.0.1                                |
 |                                      |                                      |
 +--------------------------------------+--------------------------------------+
 | **Release date**                     | February 17th, 2022                  |