4.15.2.0: release notes updates

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

Author: yadvr

source/conf.py

@@ -26,7 +26,7 @@
 # The short X.Y version
 version = '4.15'
 # The full version, including alpha/beta/rc tags
-release = '4.15.1.0'
+release = '4.15.2.0'
 
 rst_epilog = """
 .. include:: /_global.rst 

source/releasenotes/about.rst

@@ -17,6 +17,15 @@
 What's New in |release|
 =======================
 
+Apache CloudStack 4.15.2.0 is a 4.15 LTS release with over 75 fixes and
+improvements since 4.15.1.0. Highlights include:
+
+• Several VMware fixes and improvements
+• Several UI and VR fixes and improvements
+
+What's New in 4.15.1.0
+=======================
+
 Apache CloudStack 4.15.1.0 is a 4.15 LTS release with over 350 enhancements and
 fixes since 4.15.0.0. Highlights include: