Fix two typos

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 473b74c..f6ecdbf 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -958,7 +958,7 @@
  * might still happen. For this reason, this is disabled by default.
  *
  * Requires: MBEDTLS_ECJPAKE_C
- *           SHA-256 (via MD is present, or via PSA, see MBEDTLS_ECJPAKE_C)
+ *           SHA-256 (via MD if present, or via PSA, see MBEDTLS_ECJPAKE_C)
  *           MBEDTLS_ECP_DP_SECP256R1_ENABLED
  *
  * This enables the following ciphersuites (if other requisites are