Fix Changelog typo

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/ChangeLog.d/add_psa_m_aead.txt b/ChangeLog.d/add_psa_m_aead.txt
index 378e9c1..3ae5809 100644
--- a/ChangeLog.d/add_psa_m_aead.txt
+++ b/ChangeLog.d/add_psa_m_aead.txt
@@ -1,4 +1,4 @@
 Features
    * Added multipart AEAD API to the PSA Crypto API
    * Added MbedTLS internal implementations of the PSA Crypto multipart AEAD API
-     supporting PolyChaCha and GCM. CCM is not as yet supported.
+     supporting ChaChaPoly and GCM. CCM is not as yet supported.