op-build v2.0.6 release notes

Also add v2.0.5 to doc index

Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
(cherry picked from commit 51218d26425624e56e53686555262fcd7e5656c4)
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
diff --git a/doc/release-notes/index.rst b/doc/release-notes/index.rst
index 80a8054..3ad2e13 100644
--- a/doc/release-notes/index.rst
+++ b/doc/release-notes/index.rst
@@ -19,5 +19,7 @@
    v2.0.2
    v2.0.3
    v2.0.4
+   v2.0.5
+   v2.0.6
    v2.1-rc1
    v2.1