Improve Changelog

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/ChangeLog.d/sha256-armce-arm.txt b/ChangeLog.d/sha256-armce-arm.txt
index 46b2ca2..0f97544 100644
--- a/ChangeLog.d/sha256-armce-arm.txt
+++ b/ChangeLog.d/sha256-armce-arm.txt
@@ -2,6 +2,6 @@
     * Support Armv8-A Crypto Extension acceleration for SHA-256
       when compiling for Thumb or 32-bit Arm.
 New deprecations
-    * Rename the SHA256_USE_A64_CRYPTO_xxx config options to
-      SHA256_USE_ARMV8_A_CRYPTO_xxx. The old names may still be
-      used, but are deprecated.
+    * Rename the MBEDTLS_SHA256_USE_A64_CRYPTO_xxx config options to
+      MBEDTLS_SHA256_USE_ARMV8_A_CRYPTO_xxx. The old names may still
+      be used, but are deprecated.