Add release notes pages for 29.1.0 and 29.2.0

Adding release notes pages for 29.1.0 and 29.2.0 versions.

[1] https://review.opendev.org/c/openstack/releases/+/816165
[2] https://review.opendev.org/c/openstack/releases/+/817401
Change-Id: I684168c3f453d332d44ffc3ae9b326205e6b54aa

Change-Id: I13bee2530d615d8d5969e866ffce6c30e40a8047
diff --git a/releasenotes/source/index.rst b/releasenotes/source/index.rst
index 6a1f8b4..3bff257 100644
--- a/releasenotes/source/index.rst
+++ b/releasenotes/source/index.rst
@@ -6,6 +6,8 @@
    :maxdepth: 1
 
    unreleased
+   v29.2.0
+   v29.1.0
    v29.0.0
    v28.1.0
    v28.0.0