docs(changelog): changelog for lts-v2.10.3 release

Change-Id: If6b19337262861fedcb6c647cc1d5063fcdd0177
diff --git a/docs/conf.py b/docs/conf.py
index 9b75fe6..59bd28f 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -14,8 +14,8 @@
 
 project = "Trusted Firmware-A"
 author = "Trusted Firmware-A contributors"
-version = "2.10.2"
-release = "2.10.2"
+version = "2.10.3"
+release = "2.10.3"
 
 # -- General configuration ---------------------------------------------------