Fix two typos

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index 2ea0b47..1038706 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -326,7 +326,7 @@
 #endif
 
 /* Use of EC J-PAKE in TLS requires SHA-256.
- * This will be taken from MD is present, or from PSA if MD is absent.
+ * This will be taken from MD if it is present, or from PSA if MD is absent.
  * Note: ECJPAKE_C depends on MD_C || PSA_CRYPTO_C. */
 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) &&                    \
     !( defined(MBEDTLS_MD_C) && defined(MBEDTLS_SHA256_C) ) &&          \