changelog: fix typo

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/ChangeLog.d/8647.txt b/ChangeLog.d/8647.txt
index 44007e2..98326dc 100644
--- a/ChangeLog.d/8647.txt
+++ b/ChangeLog.d/8647.txt
@@ -2,7 +2,7 @@
    * psa_import_key() now only accepts RSA keys in the PSA standard formats.
      The undocumented ability to import other formats (PKCS#8, SubjectPublicKey,
      PEM) accepted by the pkparse module has been removed. Applications that
-     need these format can call mbedtls_pk_parse_{public,}key() followed by
+     need these formats can call mbedtls_pk_parse_{public,}key() followed by
      mbedtls_pk_import_into_psa().
 
 Changes