docs(changelog): changelog for lts-v2.10.4 release

Change-Id: I216dd3799384212f6bc87977501ad4f0f371d57f
diff --git a/docs/conf.py b/docs/conf.py
index 59bd28f..ef7fe7e 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -14,8 +14,8 @@
 
 project = "Trusted Firmware-A"
 author = "Trusted Firmware-A contributors"
-version = "2.10.3"
-release = "2.10.3"
+version = "2.10.4"
+release = "2.10.4"
 
 # -- General configuration ---------------------------------------------------