Wording improvement

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index e40da0e..1cb38eb 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -1781,7 +1781,7 @@
  * in mbedtls_config.h.
  *
  * If the symbol #MBEDTLS_PSA_CRYPTO_CONFIG_FILE is defined, it specifies
- * an alternative location to use instead of include/psa/crypto_config.h.
+ * an alternative header to include instead of include/psa/crypto_config.h.
  *
  * This feature is still experimental and is not ready for production since
  * it is not completed.