Update ChangeLog.d/8726.txt

Co-authored-by: Janos Follath <janos.follath@arm.com>
Signed-off-by: v1gnesh <v1gnesh@users.noreply.github.com>
diff --git a/ChangeLog.d/8726.txt b/ChangeLog.d/8726.txt
index dc789b4..c1e5a40 100644
--- a/ChangeLog.d/8726.txt
+++ b/ChangeLog.d/8726.txt
@@ -1,3 +1,2 @@
 Features
-   * Add platform support for z/OS.
-   
+   * Add partial platform support for z/OS.