Explain why the programs have been removed

Also fix the indentation of `*`.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/ChangeLog.d/9964.txt b/ChangeLog.d/9964.txt
index ca0cc4b..30029f2 100644
--- a/ChangeLog.d/9964.txt
+++ b/ChangeLog.d/9964.txt
@@ -1,5 +1,5 @@
 Removals
-    * Removal of the following sample programs:
+   * Sample programs for the legacy crypto API have been removed.
           pkey/rsa_genkey.c
           pkey/pk_decrypt.c
           pkey/dh_genprime.c