create 1.2 section in changelog

forgot to do this in the earlier commit

Change-Id: I6cd29865edd761f6a047d9c4ac363280e24565d9

doc/build/changelog.rst

diff --git a/doc/build/changelog.rst b/doc/build/changelog.rst
index 1abf95a..31ef5b1 100644
--- a/doc/build/changelog.rst
+++ b/doc/build/changelog.rst
@@ -3,13 +3,17 @@
 Changelog
 =========
 
-1.1
+1.2
 ===
 
 .. changelog::
     :version: 1.2
     :include_notes_from: unreleased
 
+1.1
+===
+
+
 .. changelog::
     :version: 1.1.5
     :released: Fri Aug 20 2021