Use headlinese for added functions, per request

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

ChangeLog.d/add_final_delay_accessor

@@ -1,4 +1,4 @@
 Features
-   * Add the function mbedtls_timing_get_final_delay() to access the private
+   * Add function mbedtls_timing_get_final_delay() to access the private
      final delay field in an mbedtls_timing_delay_context, as requested in
      #5183.

ChangeLog.d/mbedtls_ecp_export.txt

@@ -1,3 +1,3 @@
 Features
-   * Add a function mbedtls_ecp_export() to export ECP key pair parameters.
+   * Add function mbedtls_ecp_export() to export ECP key pair parameters.
      Fixes #4838.

ChangeLog.d/mbedtls_tlsver_enum.txt

@@ -5,6 +5,6 @@ New deprecations
      mbedtls_ssl_conf_min_tls_version().
 
 Features
-   * The new functions mbedtls_ssl_conf_max_tls_version() and
-     mbedtls_ssl_conf_min_tls_version() use a single value to specify
+   * Add functions mbedtls_ssl_conf_max_tls_version() and
+     mbedtls_ssl_conf_min_tls_version() that use a single value to specify
      the protocol version.

ChangeLog.d/md_info_from_ctx.txt

@@ -1,3 +1,3 @@
 Features
-   * The new function mbedtls_md_info_from_ctx() recalls the message digest
+   * Add function mbedtls_md_info_from_ctx() to recall the message digest
      information that was used to set up a message digest context.