Changelog: when adding a new function, state its name

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/ChangeLog.d/md_info_from_ctx.txt b/ChangeLog.d/md_info_from_ctx.txt
index f8ec1a0..8cee593 100644
--- a/ChangeLog.d/md_info_from_ctx.txt
+++ b/ChangeLog.d/md_info_from_ctx.txt
@@ -1,3 +1,3 @@
 Features
-   * Add a function to extract message digest information from a message
-     digest context.
+   * The new function mbedtls_md_info_from_ctx() recalls the message digest
+     information that was used to set up a message digest context.